HomeMy WebLinkAboutVAIL VILLAGE FILING 1 BLOCK 1 LOT 10 LEGAL.pdfb
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Design Revi oard
ACTIOI{ FORl,l
Departmefit of Community Development
75 South Frontage Road. Vail, Colorado 81657
tel: 970.479.2139 fax.970.479.2452
web: wyuw,vailgov.corn
I
cwB
Project Name: REDDING REROOF
Prcject Description:
DRBNumber: DR8060458
FINAL APPROVAL FOR A RE-ROOF.CEDAR SHAKE TO METAL. BROWN IN COLOR
Pafticipants:
OWNER REDDING, STEPHEN J. - REDDINO9/2512006
ANGELINA C, TRUSTEES
PO BOX 1640
GOLETA
cA 93116
APPUCANT ROCKY CHRISTOPHER 09 12512006 Phone: 476-7990
Prciect Address: 342 MILL CREEK CR VAIL Location: 342 MILL CREEK CR
Legal Descrlption; Lot: 10 Block 1 Subdivisionl VAIL VILIAGE FILING 1
Parcel Number: 2101-0824900-7
comments:
Motion By:
Second By:
Vote:
Conditions:
BOARD/STAFF ACTION
Action: APPROVED
Date of Approval' 0912712006
Cond:8
(PLAN): No changes to these plans may be made without the written consent of Town of
Vail staff and/or the appropriate review committee(s),
Cond:0
(P|-AN): DRB approval does not constitute a permit for building. Please consult with
Town of Vail Building personnel prior to construction activities.
Cond: 201
DRB approval shall not become valid for 20 days following the date of approval.
Cond: 202
Approval of this project shall lapse and become void one (1) year following the date
of final approval, unless a building permit is issued and construction is commenced
and is diligently pursued toward completion.
Planner: Elisabeth Eckel DRB Fee Paid:s20.oo
.l eu i nor Exterior Alterati$
Application for Design Review
Department of Community Development
75 South Frontage Road, Vail, Colorado 81657
tel: 970.479.2L28 tax: 97O.479.2452
web: www,vailgov.com
All projects requiring design review must receive approval prior to submitting a building permit application. Please
refer to the submitbal requirements for the particular approval that is requested. An application for Design Review
cannot be accepted untii all required information is received by the Community Development Department. The
project may also need to be reviewed by the Town Council and/or the Planning and Environmental Commission.
Design rcview approval lapses unless a building permit is issued and construction @mmences within C-.l
one year ofthe apProval. -Osa+x- v
Description of the Requestr /V2-LL) l<LI:)i-tUC- /fW-t-*-"{/tL- j-:>4/,t1zt-., ro
_ I rtlcrec- - /
Locationof theProposaf! Lot: /cl Block: I Subdivision:lhtgl/2q-ac
General Information:
Physical Address:'Ci)
Zoning:
parcel No.: .at tg t OB l4ci nO'? (Contact Eagle Co. Assessor at 970-328-8640 for parcel no.) t I
Zoning: S'*-r., t . Fr+*, , ,-v t/ D "t&L{- }<
Name(s) of owner(s): ' (E-oo, o.rco , StzPHr""l |\,|
u^itingoaa,",,, -/1/-- Fr+:+/?4D/fu!?+q 6 /b4o.4-/-LC+734
Owner(s) Signature(
r
Mailing Address: 2=< LLI+--- &- '32- 2'>c'' 'r, r i!ii"' - l E-mail Address:
-Fax:
'\A TypeofReviewand Fee: W
tr Signs $50 Plus $1.00 per square foot of total sign area.
E Conceotual Review No Fee
D New Construction $650 For construction ofa new building or demo/rebuild.
tr Addition g30O For an addition where square footage is added to any residential or
commercial building (includes 250 additions & interior conversions).
tr Minor Alteration $250 For minor changes to buildings and site improvements, such as,
(multi-family/commercial) re-roofing, painting, window additions, landscaping, fences and
retaining walls, etc.
Minor Alteration $20 For minor changes to buildings and site improvements, such as,
(single-family/duplex) re-roofing, painting, window additions, landscaping, fences and
retaining walls, etc.
D Changes to Approved Plans $20 For revisions to plans already approved by Planning Staff or the
Design Review Board.
tr Separation Request No Fee
I Oi
. (,
'l*,**{t*** f *f tf +++**at'|tl+*+*'i****'l"t***** ** ***'}*,1*:1.*{r'1"},t**'l',1**'t****i.'}****t+*++*++***tl*i*++++f
TOWNOFVAIL, COI,ORADO Statemenr l*a****************'}**t*******l'*****+l*i**f,+*+*+++*+*+*++*+**t*++***+******+*a*+**i******f**
Statement liluriber: R060001-527 Anount: $20,00 09/2s/200670:32 Ali
Palment Method! Check Inlt: dIS
Notation: CHRISTOPIIER &
KINDAIJIJ R. E .
Permit No: DR8060458 $4re: DRB-Minor AIt,, SFR/DUP
Parcel No! 270I-082-4900-1
SiTC Addreeg: 342 MTLI- CREEK CR VAIIJ
L,ocation: 342 MITL CREEK CR
Total Fees: S20.00 This Payment:$2o. oo Total ALL Pmts! S20.00
Balance :$o. oo l"lt*'i{t*'}*'}***'****{'*{'*,}******+tlft+*++*+*********'}'*,}*'}**'t********1********+******ff**++'t+++*+
ACCOUNT ITEM LIST:
Account Code Degcrl,ption Current Pmts
DR OO1OOOO3LL??OO DESIGN REVIEW FEES 20.00
TOWN OF VAIL
75 S.FRONTAGEROAD
VAIL. CO 81657
970-479-2t38
ot*r*"roFcoM*^*oru.rot^, fu tf;/.uT'€t I ' /o1 1b, btoot_ |
# ofGas Applianccs: 0 # ofcas togs: 0 # of Wood Pellet: 0
FEE SUMMARY
Mechanical--> $400. 00 Restuarant Plan Review-->
Plan Check--> $100.00 DRB Fe€-----_......_->
50.00 Total Calculated Fe€s--> S503 . 00
S0 .00 Additional Fees---->
Investigation.>
Will Call--->s3.00
BALA}ICE DUE->
Ifem: 05100 BUIITDING DEPARTMENr
o6/Lo/2oo4 ,Js Action: AP
ITCM: 05600 FIRE DEPARI14ENT
CONDITION OF APPROVAL Cond: 12
(BL,DG.): FIELD INSPECTIONS ARE REQUIRED TO CHECK FOR CODE COMPIJIAITCE.
Cond: 22
(BI-,DG.): COMBUSTION AIR IS REQUIRED PER SEe. ?01 OF TI{E 1997 IIMC, OR SECTION
701 0F THE 1997 IMC.
Cond:23
(BI,DG. ) : INSTA],I,ATION MUST coNFoRM To MANUFACTuRES INsTRucTIoNs A}TD To CTIAPTER
10 OF THE 1997 TJMC. CHAPTER ],0 OF THE 1997 TMC.
NOTE: THIS PERMIT MUST BE POSTED ON JOBSITE AT ALL TIMES
MECHANICALPERMIT Permit #: M04-0101
Job Address: 342MILL CREEK CR VAIL Status . . . : ISSUED
Location.....: 342MLLL CREEK ROAD Applied . . : 0611012004
ParcelNo...: 210108249007 Issued. .: 06ltt/2004
Project No : a\ q- Expires . .: 12/0812004
owNER REDDING, STEPHEN ,J. - REDDINOS/LO/2}O4 phone:
ANGELINA C. TRUSTEES
PO BOX 1540
GOI-,ETA
cA 93115
License:
coN:rRAcToR WHITE WATER PIJUMBING 06/70/2004 phone: 970-328-3708
P.O. BOX 4290
EAGLE, CO
8153 1
License: 255-M
APPLICAM WHrTE WATER pr,rrMBrNG 06/10/2004 phone3 970-328-3708
P.O. BOX 4290
EAGLE, CO
81631
I-,icense: 255-M
Desciption: REPLACE BOILER EQUIPMENT
Valuation: $20"000.00
Fireplace lnformation: Restricted: Y
$0.00 TOTAL FEES---------> $s03.00 Tot^l Permit Fee------> $503.00
Palments-*-_-> $503.00
$0.00
s0 .00
Cond: 25 v
(BLDG.): GAS APPITIANCES SHAIJIJ BE VENIED ACCORDING TO
TERMINATE AS SPECIFIED IN SEC.8O5 OF THE 1997 I]MC, OR
Cond: 29
(BIJDG.): ACCESS TO HEATTNG EQUTPMEMT MUST COMPIJY WITH
THE 1997 I]MC A}ID CHAPTER 3 OF THE 1997 IMC.
Cond: 31
(BI-,DG.): BOII-,ERS SHALL BE MOIINIED ON FIJOORS OF NONCOMBUSTIBI-,E CONST. IJNITESS
I,TSTED FOR MOI'NTING ON COMBUSTIBLE FIJOORTNG.
Cond: 32
(BLDG.): PERMIT,PIJAIIS AIID CODE AI{AIJYSIS MUST BE POSTED IN MECIANfCAL, ROOM PRrOR
TO A}I INSPECTION REQI]EST.
Cond: 30
(BLDG. ) : DRAINAGE OF MECHANTCAIT ROOMS CONTATNING HEATING OR HOT-WATER SUPPLY
BOIIJERS SIIALL BE EQUIPPED WITH A FITOOR DRAIN PER SEC. L022 OF THE 1997 I!MC, OR
SECTION L004.6 0F THE L997 rMC.
o
CHAPTER
CIIAPTER
CHAPTER
8 AND SHAIJIJ
8 OF THE 1997 IMC,
3 AIID S8C.1017 0F
DECLARATIONS
I hereby acknowledge that I have read this application, filled out in full the information required, completed an accurate plot plan,
and state that all the information as required is conect. I agree to comply with the information and plot plan, to comply with all
Town ordinances and state laws, and to build this structure according to the towns zoning and subdivision codes, design review
approved, Uniform Building Code and other ordinances ofthe Town applicable thereto.
REQUESTS FOR INSPECTION SHALL BE MADE TWENTY-FOUR AT 479-2149 OR AT OUR OFFICF. FROM 8:00 AM - 4 PM.
NTRACTOR FOR HIMSELF AND OWNEF
++ ++ ++* * * * * * * *'t ** ** {.'t'*****t l+ I + tlt{. ** l' *** * * ** 't** * ** *** +* *+++++* * {' * '} * * * 't *'} *** * * * * t** + * f** * *+*
TOWNOFVAIL, COLORADO Sbtement ***'1.****I*'l l'l**'***++++++*+t**'lrt****'|!l'*****{'*'t'*'t***+*************'tr't i't * **** ** * * * * ***t t,t *tf ****
Statement Number: R040005007 Arnount: 9503.00 OG/LL/2O04L1:13 AM
Pa)ment Method: Check Ini.t 3 DDe
Notation: whitelrater P & H
11139
Permj.t No: M04-0101 Tl4)e I MECHANICAL PERMIT
Parcel No: 270t08249007
Site Address: 342 MILL CREEK CR VAIIr
I.ocation: 342 MILL CREEK ROAD
Total Fees: $503.00 This Payment: $503.00 Total AIJIJ ptnts: 9503.00
Balance: 90.00
,1. +* ** '!'** * * * * r' * ** ** * +,t+ * **'**'l '* +*{. * ** r' *** * ** * {'
't' * * ** t* i * * * * * *+* *** * * * r' ** t! *'} *** * * * *
'tr
+'t' '} * * * * * **+ +
ACCOTJNT ITEM LIST:
Account Code Description Current Pmts
I'lP OO1OOOO31111OO MECHANICAL PERMIT FEES 4OO.OO
PF 00100003112300 PLAN CHECK FEES 100.00
t,lc OO1OOOO31128OO WILL CALL INSPECTION FEE 3.OO
JUN- 1'O-44 AS :58 A1'l l'lH I TEI,IATER PLUI{BI NG o s3 o 97 2e3368 P. S2
RECEIt/ED
Pernll wlll not br Ncctpted
jor Pzrccl
trrrttltl* frrfi r..r*rrFoR o
Woilcles3: New() Addillon( ) AlteretionllrF;cptrb{ Other( )
Boflef Looalbnr ldodorJz-]/ Erlerlor ( ) Othar ( )Oms tn EHU ortsl st lhli locetion: Yee r I No (4
TyprofBldgr Eingh'funilyff ouptcrl ) Mutti-famtty( I conn€rdd( ) Rrrrrqr.nt( ) orh.r( I
No. ol Exieting Dwalling Unltr In lhic building:No. at Accommodellon Unils in lhie bulldlnll:
Nd?ype olFlreplaos hopoced: G3s Appllrnc.t ( I ca3 Logl ( ) wooonemt 1 ) wooo aurning (NoT ALLowEo)
ulli E convonion from g
\vrl M.bhdcr\F{n MS\FBRMITSut{ECt I PBRM,DOC
07-19-2004
7:1't am
lnspecdon Requast t-
Requested
A/PrD lnformaton
Ac,lhrttry:
Concn ryyF:
Offrof :
AFpllcani:
CorltEclor:
D€scrlpflon:
t/lO+O1Ol Typ.: &MECH
Occuponcy:
REDD,I},IG, STEPHEN J. - REDOIhIG.
WHITE WATER PLUMBING
WHITE WATER PLUMRIiIG
REPLACE BO|LER EOUIPMENT
gtrlrF:
lmpAre6'
It€m: 32O
Item: 33O
Item: 340
nem: 39O
MECH-Exhflrs{ Floods
MEeH-Supfrty Ah
MECH-Mlsc.
MECH-Flnal
O?fl$lM Inspeclor GeD Acllon: CR CORRECTION REOUIRED
Eomments: PROVIDE BOTH INSTRUET|oI,IS AND RECORD OF INITIAT START UP ON SITE.
07/16;'(X Inspoctor: GCD Actlon: CR CORRECTICN REOUIRED
Comments: BOILER 2 CO2 LESS TF!qII 3.:6 MIN CHECK CHIMNEY DMFT. OPEN UP COMB AIR AS
NOTED ON ROUGH.
lnspect Date: Monday, July 19, 2004 oiflon Area: JRM ''
Slte Adoress: 342 MILL CREEK CR VAIL
342 MILL CREEK ROAD
subrlH: AsFR
Phons: 97G32&3708
Phone: 97G32S37OE
Actior: CR CORRECT1ON REOUIRED
Ac{o,n: AP APPROVED
."R"1"4f;?,.4,rr
Requestedrnsoectfon(sl h7^l?Oq /V,ZD,Item: 390 MECH-Final Re{r6s$dTlnie: 01:00PM ' ,Y Roquestor: WHITE WATER PLUMBINGJScoI Phone: 37S3084 ,/ \
AsslgngdTo: CDAUS /l^ /,{ Enter€dBy: t-CRmpgelt K(-)Acton: ttlY rlrneEro: /4
It€M COMM€Nb: FROVIEFFN:NNSTRUCTIONS AI'ITFEfORD OF INITIAL START UP ON SITE.
IIem Comm€nls: BOILER 2 CO2 LESS TF{AN 3% MN CHECK CHIMNEY DRAFT, OPEN UP COMB AIR AS NOTED ON
llem: 2(X) MECH'Rouoh
C6l14l0,{ Inspector: GCD Action: NO NOTTRED
Commerrts: iIOURTESY WALK Tl lRU. MAXlL,lfE CLEAR AT FRONT OF BOILER.
CCMB AIR lS REOD TO BE INCREASED FF.OVIDE ls,q in PER 3000 Btu i DUCT Hl. REMOVE
TIIE DOWN LEG CN LO DUCT AND CLEATJ EXTERIOR OFENING. ADDITIOI.I,AL COMB AIR
MAY BE IiEOD IF BURNER"TEST FAILS PROVIDE TESTAT FINAL.
O6/3tY04 lnsp€ctor: GCD
ComnEnls: NO ACCESS
Iteln: 31O MECFtlt€oUno
ttem: 315 PLMB-GaS Piinq -' Amro\r€d "oTto?tu lmFcctor ' 'cDAvls
Comm€nts: GAS PIPING ztil AIRTEST
Page 20
ISSUED
JRM
REPT131 Rnn Id: 2OgA
_L Jl.J1- 13 aOO+ 3 t 12P1'1 l{E- LRSERJET 3200
Fecord of lnltld lmpfotlon rnaln up
F.1
Fl6cord lhG lollewlng Inlormtllm during l|tttlat stsrt up of thr ballFr'Thl8 record wlll *rrv' l! e fcl€r'nc' for ve'rly
InspaotlonD,
ltlhatanz IL -t
Putllng Into opirrllon Rrmarkt or mee6ulament
1. Noto type ol ess {ntar
2, Chcck cornHrttlon elr nnd ventllatlon opcnlnga 31fl flue oonncqllgrl V olL
9. Chcck bolltt lor cotrect orlflcee, gee table 5 bllovt Mas
4.Flll bollsr wllh w.ter snd purge rir from lht syslem W otz.
5, Measur. gas lnlet prottura In Incher waler oolumn '?,-a-?-
8. Chrck mrnfoltl prEslut€ and adluel ll ngoerrrty 4:9-
!,3akage ttrt durlng oPgrataon
Chsck pllot and r?rFln burn€r flanet !!qlqEyt!1T'lqq4lg!C ob
8, Tgl$ fhck m.Nauhmantl; r.a Inetrucuong page f 5 g
8.1 Groas ehok gea tcmPeralwc ls In oF
Record rbom temprralurc 11 InoF
8: Nst sled( otg tcfipct€lure ts - tr lh 'F /fF,F
8.3 Crrbon dloxlde content (C021 ln c,t
6.4 Csrbon monoxldc oont€nt rttck {CO), .lrfr€e In ppm ' -.,,?rQ-Ila
8,5 Chimnry clr$l mln. ln Inchee wsler column.
Enrure lhat no f,ue gae ie apllllng frqn the rdlef sprning
g, Ch€ok hlgh limlt squa.lat 0per$on doL
10. lnform owncr/olgn gnd hatrd over thc tec;hnlcal docunmtr tr
11,Inetrlllng Csntrcclor
Owner
Slgnature
glsnauJr€
n
n
/k_a&,aUn --
f
orlficc$lzr p-2000t0
Eolbr glzrl 73 92 116 t32
Nrlurd qrs 3.60mm 3.70 nm 3.9Orflrl 3,90nm
Prropnnr Gac 4.35mm 2.40|nm !.tomn 2,60 mm
Trbb 6
4DB t+tf kra' |€'fif
\
,.,,1
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' ' JUL lS 200.+ 3r lePH HE-LRSERJET 3eO0
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Chen-Northe)lnc.5unu Hoao rb4 G - "Grenwooo Spnngs, CO erOO- ;:-^ .303/945.7458 bl#lou s,,,no.
Great Falls
Helena
Phoenix
Pocatello
Flock Springs
Sall Lake Crty
San Anlonio
Tn Citres
Yakrma
Dcnver
E iko
Evanston
Gile e
Glenwoocl Sprrnq;s
March 20, 1989
Subject: Geologic Hazards Evaluation,
342 Mill Creek Circle,
Lot 10, Block 1,
Vail Village Filing 1,
Vai1, Colorado.
Job No. 4 208 89
Phi.l Hoversten
c/o Christopher Denton Real Estate
2BB Bridge Street
Vail C0 81657
Dear Mr. Hoversten:
This letter presents the findings of a geologic hazards evaluation for the proposed new residence to be Located aL 342 M111 Creek Circle in Vail,
Colorado. ft is our understanding that the existing residence wj.ll be razed
and replaced wibh a three story wood frame residence. The hazards evaluaLion
consisted of a site reconnaissance and review of published geologic hazards
reports for the general area. The work was conducted in general accordance
with our March 16, 1989, agreement letter to Phil Hoversten.
The existing residence is Located on the north side of MilI Creek Circle
which traverses gentle bo moderately sloping terrain of the south valley floor
of Gore Creek. The site ls on the lower part of a well developed alluvial fan
of Mill Creek that exits the steep valley side about 500 feet southeast of the
subject site. Residences are Locafed on the adjacenb lots to the north, west
and east. Open, undeveloped ]and lies upslope to the south.
Reglonal debris flow hazards mapplng indicates thab Mill Creek to the
easb and southeast of the 1ot has a potential for debrls flows (Mearsr 1984).
Lot 10 Lles beyond the limlt of the mapped moderafe hazard boundary, but ls on
the alluvial fan and could be subjected to some debris flow activiLy. High
velocity debris flows do not appear probable on LoL 10. The sj.te development
plans provided by Morter Architects lndlcate the proposed building site is noL
lmpacted by potential flood flow of Mill Creek.
Regional rockfall hazard mapplng indicaLes that Lot 10 is not subject to
rockfall hazard (Schmueser and Associates, 1!84).
Regional avalanche hazard mapping indicates thaL Lot 10 is well beyond
run out lirnits of small avalanches which could potentially occur on the south
valley slde (Mears , 1979).
A member of the [EIF] group of companies
Phil Hoversten
March 20, 1989
Page 2
. In syrynaryr Lot 10 and the adjacent lots ln the subdivision are exposed to potential debris flow hazard. The hazard on Lot 10 is not considered Lo be severe. The owner should be aware of thls hazard. Based on our observations,constructlon of the proposed resldence on Lot l0 should noL increase thi exlsting hazard potentlal. to adJacent propertles and structures lncluding pub11c roads, rlghts-of-way, ease{nents and utllltles.
rf there are any questlons concernlng this evaruation or if we may be of further servlce on the project, please let us know.
Sincerely,
CHEN-NoRTHERN, rNC.
Btt
'.4',1 --
,) ,,,t -' / |!f,-*:l' /i:*-'(. 1: -
Steven L. Pawlak, P.E.
SLP,zec
Rev. By: R.G.M.
Mears, 4.I., 1979, Col-orado Snow
Avalanche-Hazards Planning :tlon No. 7.
Mears, A.I., 1984, Debris-Flow and for the Town of Vall.
REFERENCES
Avalanche Area Studies and
Coloraodo Geologlcal Surve
Guldelines for
Special Pubfica-
Debris-Avalanche Hazard Analysis: Prepared
schnn:eser & Associates, 1984, Rockfai.l study - Town of vail: prepared for the
Town of Vail.
Chen-Northern, lnc.
January 30, 1989
LOT 10, BLOCK 1, VArt
VILLAGE FIRST FILING
APPLICATION FOR A VARIANCE
For years the location of the existing home on Lot 10,Block J., Vail Village First Filing (342 MilI Creek Circle)has established an important configuration of open space for the surrounding properties. This space takes the shape of a reverse rrl..tr, beginning with the tand immediately north of the structure and continuing east and south to include all of the lot east of Mill Creek.
The owners of the surrounding properties want dearly to maintain that open space. This request for front and stream variances maintains that open space, to everyonets benefit.
Granting these reguested variances to paragraphs 18.13.050 and L8.58.300 of the Town of Vail Zoning Ordinance will preserve the unique character of inner MiIl Creek Circle: a setting of openness and excellent view corridors in all directions.
Granting these variances will acknowledge:
1. The desires of the neighbors.
2. The hardship imposed by MiIl Creek's bisecting the property.
3. The applicantrs willingness to leave undeveloped roughly three-fourths of hj.s developable property.
4. The fact that the proposed encroachrnent at the front setback is similar to the encroachment of the existing structure, and indeed is similar to (or LESS
THAII) most of the homes on MiLl Creek Circle.
5.The requested creek setback variance occurs totally
on private property. This is NOT a creek which is in a public tract. It is NOT accessible to the public.It maintains all the landscaping at, and appearance from, the public right of way.
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MoruenAncnIECTS
,January 30, 1989
C
tolt 10, BLocK 1, vArt
VILLAGE FIRST FILING
APPLTCATION FOR A VARIAI{CE
Page Tuo
Regarding ltems A1 through A3 of the Application for a
Variance:
A1 . See conunents above.
A2. No speclal privilege is belng granted. These set-back variances will be ln keeping with exlsting
structures on this site and neighboring sites.
As stated above these varLances will simply maintain the existing neighborhood character, to everyoners
benefit.
A3. The varlances provide a positive effect on views and
openness, wlth No negative effect on any of the lis-
ted items.
oo
MorunnAncnffEcrs
January 30, 1.989 ,t
LOE X.0, BLOCK 1, VArL
VTLLAGE FIRST FILING
ADi'ACE}IT PROPERIY OW}TERS
,
Mr. and Mrs. Robert Gunn
332 ttlill Creek CLrc1e Vall, Colorado 81657
Mr. and Mrs. Rlchard H. Olson c/o Olson Industrles, Xnc.
4550 Jackson Street
Denver, Colorado 802t6
Mr. and Mrs. Slaughter
P.O. Box 1508
San Angelo, Texas 75902
Mr. and !!rs. George Caulkins c/o 1.500 Broadway - Suite 2L00
Denver, Colorado 80202
.O
DEPARTMENT OF THE ARMY
sAcRAMENrot)rs:?;;::l"^tr:' tNGTNEERS
APR
SACRAMENTO, CALIFORNIA 95A I 4,4794
{?/-on. ooo lnw " ilstr
t0 lSg a: ful &stttt
REPLYTO
ATT€NTION OF .-\pril 7, 1989
Regulatorl'Section
Ms. Nancy Fridstein
Wright lrater Engineers, lnc,
2490 West 26th At.enue Suite 100 A
Denver, CoLorado 80211
Dear Ms. Fridstein:
I am responding to your letter dated March 2i, l9g9 and attached plans, l'our correspondence concerns channel realiEnmerrt.on a reach of lliLl Creek near the Town of Vail, in llaEle Countl,,Colorado.
You inquired about the possibilitr of this reaoh ol' ltjtl creeli being located above the headwaters. h'e have rer.ier.'ed oul..headwater data and the bifurcated nature of MirI creeh as it approaches its confruence xi th Gore creeli. our data irrdieate that the ltill creeli basin naintains an a\.el'age snnual disclir:rge of' approxirnatef I' 9 cfs. h'ithout conr.incine -phr-sieal data indicatine otherwiser H€ i.'i1l assume that tlie ol'r{irral }li l. I ('t:c.eli
channel, (liest illirr creeli ) is Located beLor.' the headr;aters.Therefore, the discharge of dredqed or fil_I material rnto )lilI Creek and/or its ad.iacent rr'etlarrds r+iLl reouire that the landor.'ner submit an individuar Department of the Arml' per.ni t appl ication .
It'e appreciate the opportuni ty to revierr the prcposed channe-i modification. Should you have additional questions. please contact Gary Davis of my stat'f at teJ.ephone Z.l 3- 1 199 ,
rel l. ,
I
eguLator]' Unit 4
zon Drive, Room 211 nction, Colorado 81506-8719
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WRIGHT WATER ENGINEERS,^flG.
2490 W. 26th Ave. Suite lil
DENVER, COLORADO 80211
LETTED @F T'RANSM ITTAL
E Plans tr Samples
the following items:
! Specifications
tr
(303) 48G1700
\ 41' . \.,1^.L \\<.- \4 q(i <-e
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WE ARE SENDING YOU p" Attached ! Under separate cover via
! Shop drawings
tr Copy of letter
! Prints
E Change order
DArE L/, /r--, l'"'tjlz-b z L- oE^
ATTENTTON I
RE: C'*+-^-,,.--\ }-J- -n-e-
(-r\ \<\ R\-..-\- t t-$,\i\ c o
coPtEs DATE NO.DESCRIPTION
\l- - ----\-
S.-t-.a^ -\ ( r--. -- - 5<,lr \
THESE ARE TRANSMITTED as ch€cked below:
E For approval
F For your use
E As requested
! Approved as submitted
n Approved as noted
D Returned for corrections
tr Resubmit-copies for approval
! Submit-copies for distribution
D Return
-corrected
prints
D For review and comment -
! FOR BIDS DUE 19- tr PRINTS RETURNED AFTER LOAN TO US
REMARKS
COPY TO
",nno, ffizi2 I
modrr?|o2 /ffirhG., hr rr. ol.?1.lr ancloaurct art not rt notad, H''dty trotlfy sr rt otc..
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WEST MILL CREEK
CHANNEL REALIGNMENT
LOT 10, BLOCK 1
VAIL VILLAGES FILING NO. 1
Prepared for:
MR. ROBERT GUNN
Prepared bY:
WRIGHT WATER ENGINEERS, INC.
ENGINEERING CONSULTANTS
DENVER, COLORADO
JUNE 1989
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Wright Water Engineers, Inc,
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DTNVER OTFICE
2490 West 26th Ave., Suite 100 A
Denver, Colorado 60211
(303) 4E0-17@
TULSA OFFICE
m1 wesr 5th st., sulte 130
Tulsa, Oklahoma 74103
(918) 584-7135
June 1, 1989
GLENWOOD SPRINGS OFFICE
818 Colorado Avenue
P. O. Box 219
Glenwood Springs, Colorado 81602
(303) 94s-255
Denver Direct line: 693-1608
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Mr. John Liou, PhD, P.E.
Federal Emergency Management Agency
Denver Federal Center, Building 701
P.O. Box 25267
Denver, CO 80225-0267
RE: I-ot 10, Block 1, Vail Villages Filing No 1.
Dear Mr. Liou:
Enclosed herein is the hydraulic analysis for Lot 10, Block 1 Vail Villages Filing No 1 in
support of the application for a Conditional I€tter of Map Revision (CLOMR). The
information provided is in accordance with your meeting of May 11, 1989 with a member
of our staff.
The CLOMR is requested to allow for the realignment of West Mill Creek through Iot 10 in Vail Colorado. The creek is to be realigned to provide the setback from the
drainageway, as required by the Town of Vail.
If you have any questions, please feel free to contact us.
Respectfully submitted,
WRIGHT WAIER ENGINEERS, INC.
encl:cc: R. Gunn
J. Morter
891-022.000
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Sheila A. Beissel
William P. Ruzzo, P
Senior Project Manager
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WEST MILL CREEK
CHANNEL REALIGNMENT
LOT 10, BLOCK 1
VAIL VILLAGES FILING NO. 1
Prepared for:
MR. ROBERT GUNN
Prepared by:
WRIGHT WATER ENGINEERS, INC.
ENGINEERING CONSULTANTS
DENVER, COLORADO
JUNE 1989
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TABLE OF CONIENTS
I- EXISTING CONDITIONS I
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PROPOSED CHANNEL MODIFICATIONS
t REsILTS oF THEANALysrs
CONCLUSIONS
I a rrDEi*r'r\. a . I APPENDIX A : HYDRATJLIC CALCUI,ATIONS
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a I , TABLE 1 : WATtsR SURFACE ELEVA,TIONS COMPARJSONS
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LIST OF DRAWINGS
DRAWING 2 t I'OT 10 - EXISTING CONDITIONS
I DRAwrNc 3 : r,or 10 - pRoposED coNDrrroNs
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DRAWING 4 : DETAIL SHEET
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IIYDRAULIC ANALYSIS
Lor r0, Br,ocK ,, nr[S"r,AGEs FTLTNG No 1
INIR.ODUCTION
The property of Lot 10, Block 1 Vail Villages Filing No 1 in Vail, Colorado is currently
owned by Mr. Robert Gunn. Drawing L shows the property's relative location in Vail.
West Mill Creek currently bisects the property from the north to the south, limiting its
development potential.
Drawil8 2 shows the site plan for the property. The development plans call for replacing
the existing structure with a larger home (see Drawing 3). In order to comply with the
town of Vail's thirty foot setback ordinance for drainageways, West Mill Creek would be
relocated from the north property line of Lot 10 to the south property line and east of its
present centerline. The proposed alignment and resulting setback are shown on Drawing
J.
The proposed alignment will provide the necessary area to replace the existing structure
(which is not in compliance with the 30 foot setback even with the current creek
alignment), while complying with the town of Vail's ordinances.
The fgllowing sections describe the existing channel conditions and the proposed channel
modifications as well as the resulting floodplain. The supporting hydrualic calculations are
provided in Appendix A
EXISTING CONDITIONS
In November of 1982, the Federal Emergency Management Agency (FEMA) adopted a
Flood Insurance Study (FIS) regulating the floodplains of several creeks in Vail including
West Mill Creek. The information regarding existing flooding conditions, which includei
pgak qorvs, flood depths and existing 100-year floodplairl was obtained from this adopted
FIS. The property, Lot 10, Block 1, Vail Village Filing No L, is located on Drawing t in
relation to the FIS flood boundary.
The segm91! of West Mill Creek on I-ot 10 extends from station 10+23 (the north properry
line) to Mill Creek Circle culvert outlet at station 11+55. The existing channel-slope is
approximately 8 percent. It is about 10 to 12 feet wide at the bottom and 3.5 to 4 feet
deep.
As shown in the FIS, the existing channel invert at station 10+23 is 8211.7 and at the Mill
Creek Circle culvert outlet 8223.5. The site survey presented on the plan prepared by
Morter Architects in conjunction with this study shows an elevation of 8211.0 and 8222.5
at the downstream and upstream limits of the channel reach, respectively. Thus, a 1 foot
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WRIC}II WATER ENGINEERS. INc'MAY 16. 1|a9 PACE I
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difference in datums exists between the two studies. In order to match the previous work
in the FIS with that of this study, the FIS water surface elevations were lowered by 1 foot.
This adjustment corrects the datum problem between the two surveys.
The topography shown on both Drawing 2 and Drawing 3 is that of the site survey prepared
for Morter Architects. As presented in the FIS, the depth of flow for the 100- and 500-
ygar storms are 3.0 and 3.5 feet, respectively. Using the site survey topography and the
FIS flood depths, the existing 10G and 500-year flood profiles and floodplains weie plotted
(see Drawing 2). The existing 100-year floodplain is within the existing channel bank.
PROPOSED CHANNEL MODIFICATIONS
In order to meet the required setback from West Mill Cree( the segment of West Mill
Creek extending from north property line (station 10+23) to Mill Creek Circle is to be
realigned to the east. The recommended hydraulic design criteria was that the proposed
channel contain the 500-year flood within its banks and the 100-year flood with a foot of
freeboard.
The proposed channel modifications include realignment of the existing channel and three
drop structures to reduce the channel slope to 0.010 ft/ft. The proposed channel alignment
and profile are shown on Drawing 3.
The proposed alignment increases the center length of West Mill Creek by 13 feet. Three
drop structures are included in the channel project, a 3', 3.5', and 4' drop. The drop
structures are sloped riprap drops with a face slope of 5 to 1. The drop structure detail is
shown on Drawing 4. The 3.5 foot drop extends from station 10+50 to 10+68, the 4 foot
drop between station 10+80 and 11+00, and the 3 foot drop from 11+25 to 11+40. The
stationing is along the realigned centerline. For aesthetic pu{poses, the drop structures are
to be constructed with ripples and small pools to enhance the visual aspectl. These pools
and ripples also serve to disipate the flow energ] in the steep channel segment.
The proposed channel cross-section is shown on Drawing 4. The cross-section has a main
channel bottom width of 7 feet, a depth of 2 feet, and banks slopes of l(Horz) to l(Vert).
Abore the two foot depth, the channel banks will be sloped at Z(Horz) to l(Vert) for an
additional rwo feet of depth. Thus, the total channel depth is 4 feet. The channel will be
riprapJined throughout the reach with Type 1,2, and 3 riprap to prevent erosion (see
Drawing 4).
The hydraulic analysis for the channel realignment and modifications was conducted using
the HEC 2, Water Surface Profile, computer program. The starting water surface
elevations at the downstream station 10+23 are 8214.5,8214.0,8213.8, and 8213.5 for the
500-, 100-, 50-, and l0-year storms, respectively. These water surface elevations are
adjusted by 1 foot to compensate for the datum difference as previously discussed. The
500-, 100-, 50-, and l0-year peak runoff rates are 230 cfs, 150 cfs, 130 cfs, and 105 cfs,
respectively.
}VRIGTIT WATER ENGINEERS. INC.MAY 16. 1!B9 PAGE 2
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RESTJLTS OF THE ANALYSIS
The proposed contours for the channel modifications are shown on Drawing 3 as are the
flood profiles for the 50G and 100-year storms. The maximum 100-year Aepttr of flow is
3.0 feet with a 3.5 foot depth for the 50Gyear storm. Both storms will be contained within
the proposed channel banks.
A comparison of the water surface elevations (see Table 1) for the FIS and the proposed
channel at the outlet of the Mill Creek Circle (the upstream limit of the study) shows that
the 50Gyear water surface would be increased by 0.1 foot. However, since the water
surface upstream of Mill Creek Circle is governed mainly by the weir overflow of the road
during the S(Fyear flood, the small increase in water surface will have no significant affect
on the water surface elevation upstream of Mill Creek Circle.
CONCLUSIONS
with- the proposed channel alignment, drop structures, and cross-section, the 100-year
runoff is contained within the channel banks with at least a foot of freeboard and the 500-
year storm runoff is contained within the channel banls. The proposed channel
modifications will not affect the flow rates through West Mill Creek oi the water surface
elevations either upstream or downstream of the property, Irt 10, Block 1.
WRIGIIT WATER ENGINEERS, INc.MAY 16, 1989 PAGE 3
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TABLE 1
\ilATER ST]RFA.CE ELEVATION COMPARISON
AT MILL CREEK CIRCLE OUTLET
STORM FEMA PROPOSED PROPOSED
FREQUENCY 1982 CHANNEL CHANNEL
STUDY WTIH DAruM
ADJUSTMENT
500-YEAR 822t.rv26.2 8227.2
100-YEAR 8226.58225.4 8226.4
5o-YEAR 8226.38225.2 8226.2
10-YEAR 8226.18224.9 8225.9
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WRICHT WATER ENOINEERS, INC. MAY T6. T989 PA6E 4
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APPENDIX A
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WRICHT WATER ENCINEERS, lNC. Date ./..lag Sheet t of_
2490 West 26th ,lve.fite S5-A ftoj. No. *qi- e ..--
Denver, Colorado 80211- Prol. Name c-. **i* -p.Tel.003)480-1700 Des. By--soR- Ckd.Bv_
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Federal Emergency Management Agency
Rtc'D OcT 2 41san
Rtc'DocT 2i1sw
Washington, D.C.20472 [vq (zoz)646-s4os / r*dl|''.,^n/
R,Jd^
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n
rN REPLY REFER ro: W lalv'"ilnnilY 65-AcK Wlt\W
Dare: ocrober 12, r99o 4W^11,n( n
Caee Nunber: 90-08-42P lV" Vf-Re: Hest MiIl Creek H
Community: Town of Vail-,
Co L orado
Dear Mr. Phillips:
This is Lo acknowledge accepEance of your request for a revision to Ehe Flood
Insurance Rate Map and/or Flood Boundary and Floodway Map for Ehe referenced
community. Our preaccepEance review of the request indicates that ne have
che rninimum data we need Eo begin our evaluation. If we need additional data
Eo complete our evaluat.ion, or if delays are encounEered, we wil-l notify you
in writing within 30 days of the date of this LeEt.er.
If you write to us about. your requesL, please include the case nunber (shown
above) in your Lett.e!. If you have any questions about the sEatus of your
revision requesE, please call Michael Baker, Jr., Inc., our Technical
Evaluation Contractor, aE (703) 838-0400, and ask for Ehe Revisions
Coordinator for your sEaEe.
S incerely,
John L. Matticks
Chief, Risk Studies Division
Federal Insurance Admini stration
cc:The Honorable Ken Rose
Mayor, Town of Vai I
Dr. Ronald L. Rossmiller, P.E.
9Jr i ghE Water Engineers, Inc.
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Rondall V. Phillips
Town Manager, Town of Vail
75 South Frontage Road
Vai1, Colorado 81657
75 south trontago load
vall, colorado 81657
(303) 479-2105
ofllce of town managct
September 24, 1990
Linda K. Duyer l{icbael Baker Jr. , Inc.
1420 King Street
Alexandria, vA 223L4
RE: Lot 10, Block 1, Vail Village Filing r
Relocation of West Mill Creek.
FEMA Reply # 65-PRE
FEI,!,A Case # 9O-080-42P
Dear Ms. Duyer:
This l-etter is to confirm that the Town of Vail is reguesting the Letter of l{ap Revision for the Gunn property on }lill Creek Circle. I understand that this letter is one of two outstanding
requirernents needed before you can approve the Letter of Map
Revision for this project. Accompanying this letter are
construction drawings fron Wright water Engineers, Inc. and naterial fron Wright Water Engineers stating that the
construction work generally conforms to the design.
I hope that these two pieces of infonnation will conrplete the
application, If you need any other infornation, please contact
Andy Knudtsen as he is faniLiar with the project. If I can be of
further assistance please contact rne at 303-479-2L06.
Rondall V. Phillips
Town Manager
Mayor
Mr. Andy Knudtsen
September 6, 1990
Pzge 2
Wright Water Engineers has not been requested to assist in a LOMR application It is entirely possible that FEMA may reject the new I.OMR application by Vail.
For these reasons WWE is taking no responsibility for the submitta[ or it's outcome.
Tpically, for these matters, an as-built drawing is needed by FEMA along with
related computations and data-
You must understand that the relocation of West Mill Creek was limited to Irt
#10 and it was not meant to solve the area-wide problem of MiU Creeh or West
Mill Creelg which involves upstream culvert pluggrng and related rock and debris
flow. The residences in Mill Creek Circle are not protected from an area-wide flood
problem even though West Mill Creek and t ot No. 10 is adequate to carry 100 year
floodwaters with the debris flow neglected.
As flood control engineerg we believe that your consideration of modest flood-
proofrng and debris flow measures would be appropriate in the Mill Creek Circle
area of Vail.
KRW/scs
cc: Brian Hyde, CWCB
891-@2.000
(MTWNVATL)
Engineer, lnc.
E
Wright Water
DINVER OTFICE
2a!r0 WC3I 26th Avc., Sultc 1fl) A
Dcnver, Colorado E0Zl1
(303) 48G1700
GTENWOOD SPRINGS OFFICE
Ela Colondo Avenue
7, O. Box 219
Glenwood Sprlngs, Colorrdo E1602
(303) 945-255
Denvcr Dircel tinc: E93-1608
July 3, 1990
Mr. Michael Mollica
Town Plamer
Town of Vail
75 South Frontage Road
Vail, Colorado 81657
RE: Irt 10, Block 1, Vail Filing Number 1
Relocation of West Mill Creek
Dear Mr. Mollica:
Wright Water Engineers is the design engineer for the relocation of West Mill Creek on
I-ot 10, Block 1.
I, Dr. Ronald R. Rossmiller, P.E., made a final construction inspection on July 3, 1990, and
found that the construction work generally conforms to the design.
During my inspection of the channel on July 3, 1990, with the contractor, Schaeffer
Construction, Inc.,I pointed out two items needing some additional minorwork and notified
Schaeffer Construction that the project was acceptable to WWE.
It is in my opinion that the channel design and construction satisff the request of the
United States Army Corp of Engineers regarding their #404 Permit.
Very truly yours,
WRIGHT WATER ENGINEERS
RLR/smg
cc: Robert Gunn
(Ltr22.RLR)
891-022.000
\
STAIEOFCCLOIUDC
COLOR^DO WATET CONSEIVATION IOATD
Dcprnmcnt of Natutal Rcrourccs
ttr Sutc Ccntc||airl Suildinj
ttt t Shctm.n Strccr
DGn|lr, Cold.do C0lo3
?lpne (t0tl t65-3.4 t
AuguEt 29, 1989
!|!. Peter PattcD, Director
Dept. of coDnuDity DeveloPneDt
?5 Eouth Frontage Roadl vall, co 81657
Dear llr. Pltten:
Our office has been contacteat by rNrigbt llater Eogineers.Inc. regarding the chlngc to the nest Mill Creek floodplain on
Lor 10. Block I of the First Flllng ot Vail Village. Plior to
end duriag ou! revien of their subnittal aaterials. ue identilied two priuary coDcerDs:
1. The poteatiel for erosion on the cbannel banks. espceially
oD the outside gf Des beads in tbe creek's elignnent.
2. The possibility that debris fan flooding associated uitb
tleet Mill Creeh night affect the site.
Tbe llrst of the6e tuo issues bas beea satiefactorily
edtdreeeed by Trigbt naler Bagineers lniE). tfe uill discuss
second lssue, debris fan flooding for nost of tbe teDalDder this letter.
Debris Floodino Alono l.ii11 Creek Circle
The previously .pptoved Flood Insurance Study for Vail follous standard engineering procedures end! iilentifies traditional riverine floodplains. It aloes Dot ialentify debris
fan flooilplains. lte feel ilebrls tan floodpleins elc a serious
coDeerD ln Vail. Unilcr separate cover we.wtll be sendlng a letter thet ld6resse6 the issue of 6ebris'fen floodlng an6
floodplain uappiag ia Vail lu general terds.
Kceping la nind the specille slte in guestion. there is r
slgnificant poaslbllity tbrt ! 100-year tlou oD lfGst l,lil1 Creeh
vouldl contribute to debris fan floodlng. The l{arcb 31. 1989
fltlE EnvironDentll lDptct Report atltes thtt tbe slte !s subject to Aebris flou hazarde. Tbe cololtdo Geological Survcy bea previously indicated thlt there is evidenee of ttl:toric cvents
lerving oebris { or 5 fcet lleep oD tbe ne8t Hill Cteek ilebrls
lov lollrtr
Govrrno,
I. Wllh.rn Mclron ld
Dulnor
Drvld W. Wrllar
DeDuty Drccror
-)
the
of
)
05 3lE'
r''
-)
a
llr. Pcter Pltten
Augutt 29, 1989
Prge tuo
fea. The Novenber, 1984 report entitled Debris Flou and Debris lvllrnche ttlztrd AnlI , prepered for the toun by Arthur Ucrls. P.8.. iitentifies debrls flou hazard ateaa in Vall,
laeluding the tfeat ltill Creek lrea.
CI|CB 6etlgnttioD is tbe legal process by whieb floodplain
BtuAieB ashieve of!icial strtuE in CoIorado. Tbe llears report brs not been designltedl by the CrtCB. There .re. tbelefore, no
etatc-designrted debris tln floodDleins ln VeiI. Nevertheless,re yould urge the toun of Vrll to conslder the fiDdings in the
Environmental lnprct Report. the concerns of the Cololado
GeoloEical Survey. and the findinge of the llearE repott.
Conelderation should also be Elven to the possibility thet one or Dore debris floods could. sonetine ia tbe future, nove the atreln brck to lts ,historic" alignDerrt or to BoDe othe!
"undesirable" alignnent.
Reconnendati ons
Tbe sealignDeDt of nest !ti]l Creeh. !B planned by HwE.'iE
rcceptable to tbc CftCB if you! coDcerDs ere linited to -t trtdlltional riverlne floo6plria aaalysie aad regrul.ation of auch floollplains. It you include in your eonsi6eration 6ebris fan llooding. it appeers tbe tovn should pu!Bue !6ditional haza!d
aaalysis aad nitigrtion Deasules.
It uould be inappropriate to Euggest tbat the propelty
oeDer sioglebandedly elininate tbe tbreat tblt 6ebris fan
tlooding fron tfest !1111 Creek eould.pose to tbe Tou! ot Vail.givea tbe fect tbrt tbir streeD reacb is relatively short. The risk to tbe rite andl to tbat entire rrea of town, as illentified in tbe llears report. lnd the long-tern aeeit for bazard nitig.tioD rnearures sbould. boueve!, be given edditioaal
consideratioa by tbe Tourl of Vail.
Sone kindl of overall rppsorcb (Etructulll an6/or
DoD-Btructural) to reduce that fislr appe!rE uarlaDtedl .Site-specific debrie flooding nitigatioD Deasurea for tbie propcrty couldl be one conponeDt of sucb an overall lpprotch.ll3 Suggert tbet tbe buildling erector revieu tbe uee16 repolt
rad give consi6eration to special structursl dlesigns ubieb rould recognize the potentiel f,or debris flous in tbe tlest Mill
Crcek basin. Pesblps. given hie faniliarity sith dcbris flou
bezar6s in vail. llr. llears shou16 be conteeted regarding
appropriate aitigation neasures for tbe Bite.
l -'/
I
t
)
lls. Petcr P.ttcD lugust 29. 1989
P.ge thrcc
nc rpprcclrte the opportuDlty to aevicu tbc fcst ltlll Crceh floodplrla rrpping revlsion. tr rlro rpprccietc tDe ooopcrettoD ec blvc aGe.ive6 fsol UtfE io rcAerd to thc first of our llstcdl eonceEna.
Il you bave any gucstions or eoDDents rogrriling the coDccrl6 cxprcrscdt ia this lette!, plcase cont.ct our olfice,
Stneerely.
\},i.-- a V=,:e-
Brleu B. Hyde 8r. lfater neaoutce Specialist Flooll CoDtrol eadl Floodplalo
Urnrgenent 6cctioD
BRE/bj
cc: Jobu Liou, PEI{A Region VIII
Briaa Urazilr, FEMA Natioaal tfillian P. Rogerr. CoIo. G"o. Survey Bill 8uzzo. rtr{E ;
)
{
1:.t
OEPARTMENTOFTHEARMY
l^ciaLE {no o|lrrlcT ooiPl of Elrotl{EEFs
.!OCA'|Tq,IAL
a^cl^taliaTo. cAuFoixr aoal'a{7aa
EtYl1O
^ttDatExf \*J llav l0' 1989
S*'r.i .Sclulatorv Section ( N26-29? )
is,ffi{.:.ff$l;.
Fi .'n:Ft :.;ltifr llr. Hillian P. Ruzzo - '' lrillbt Hater Engineere, Inc.
cr ..
2190 f,eet 26th Avcnue
Suite 100 A
Denver, Colorado 80211
Dear Hr. Ruzzo:
I an responding to lettere dated April 13 and 24, 1989 fron
t{ri8ht lJater Engineers. Ine. end s letter dated April 24. 1989
fron llr. Joe Hacy of Vail Associates, Inc. This correspondenee
pertained to the relocation of a portion of the l{est MilI Creek
in the Town of Vail, Eegle County, Coloredo.
The U.S. Arnr, Corps of Engineerg has issued a nationwide
general pernit allowing the dischar8e of fill naterial into iwaters of tne United States" that are located above the head-
Haters provided the loas of, or gubetantial adverse nodification
to, these "waters" is less than one (11 acre. Based upon the
infornation eubnitted, ne have deternined that your project can
proceed eubject to this nationwide Seneral pernit providqd the
pro.ieet complies with the enclogqd speeial cgnditions and best.
i'ailE.""friacti""* you ettouLd be aware that this verification
lJ valid for onl.y a two-year period.
As additional best DanageDent practices' we strongly
reconnend that you conatruet ae Least one drop structure within
the new channel to inhibit vertical degradation. lrle also
recomnend that you transplant and/or re-establish the riparian
wetland connunity along lhe new channel to pronote atrean bank
stabilization, to enhance aquatic habitat and to enhance
aesthetics.
l{e have asgiSned Number N26-29? to your project' Please
reference this nuober in any correspondence subnitted to this
office concerning Your Proiect.
aulatory Unit {
zon Driver Roon
tion, Colorado
ztl
81506-8? 19
Enclorure
?6{ Bor
t& *'
,-*'-.fl '._t.n
*'i..''
ENVIRON].IENTAL I}IPACT REPORT
FOR
LOT 10 BLtrtrK
VAIL VILLAGE
FIRST FILINE
PREPAFED FOR
ROEERT GUNN
33a lttll Crck Ctrclr
Vrtll Colorrdor Ef6l7
PREPARED BY
t{RtEHT I{ATER El{Ell€EREr lNC.
DEIWER, Eq,ORADO
n tRcH 3l I ItB9
, rji
o
l. INIROilETIOiI
This project proposes to rc:lign tlest l'lill Creek as it crosseE lot l0 block 1
in Veil Village lst Filing subdivisionr Vailr Colorado. The purpose of the
channel relocetion is to increase the building site area such that a 41000
iquar! foot residence cen be constructed on the property. The owner of lot l0
block I is l.lr. Robert Bunn, rhose residence is 33? l'lil I Creek Circle' Vail
Colorado, 81657r .lso known as lot ll.
This report is in response to the Town of Vail Coder Chapter t8.56
Environnental Impact Repor ts.
II. 6ENEFA. LtrATI(t{
The property on nhich the project is proPosed is lot l0 block I of the Vail
Village tst filing subdivision. The site is located in the center of Vail
along tlest l.li I I Creek, Figure t identifies the site lo€ation. llill Creek
Circle is the southern border of the property.
trest l,ti I I Creek runs through the center of the property in an approximate
north south direction. The site is located approxirnately 1000 feet upstream
of the conf luence of l.lest l"li l1 Creek and Gore Creek.
Itl. DESCRIPTIO.I ttF PROFEFTY
The area of the lot i5, approximately 0.4 ecres. The site slopes to the north
at slopes of seven to fifteen percent.
The property currently has a sinqle family reEidence and
pool/bath house gtructure on the siter which is jointly shared
Vegetetion on the site includes Spruce, Fir, and Aspen trees
residence, nillows along the creek and native grasses east
llest ltill Creek flow from south to north across the property.
the channel iE about 150 feet.
The si te is zoned pr inary/secondary residential . The
realignrnent rill not effect present zoning claEsification.
IV. DRAtilAGE 8A5IN DESIRIPTI${
portions of a
by three I ots.
surroundinq the
of the creek.
The length of
proposed creek
l,lest t'li I I creek, shich traverses the proPerty, ie a left bank maior
drainegeway tributary to Gore Creek. The creek crosses Mill Creek Circle in a
6O" dieneter reinforced concrete pipe (RCP). The drainage area at Gore Creek
is approxinately 3.6 square niles, in eccordance nith the Federal Energency
llanagenent Agency report, Flood tnrurrnce Etudy Torn of Vrll Eolorrdo dated
Novenber e, t98e (FEllA REP0RT). The site is located about 1000 feet south of
the 6ore Creek confluence.
EIVIROIIIETTAL IIIPACI REP|IRI PI6E 1
There are trro setg of flood hezard naps and studies designated end edopted for
the Torn of Vail. These are: t) The Flood InEuranse Study for the Tonn of
Veil, Colorado, by the Federal Energency f.lanaqement Agency (FEl'lA REPoRTt in
t98? rhich eppl ies to the area encofitprssed by the Town of Veil .3 of December
I, l9gO, end P) 6ore Creek Floodplain lnformation Study for the Colorado l,later
Conservation Board by Hydro-Triad, LTD in 1975r nhich applies to an area
dcscribed in the l,lest Vail annexation plat, deted Decernber l8r 1980.
The 198? FEI'IA REPORT applies to the project site.
Eest end l'lest l'l i I I Creeks each drain 3.6 square nri les of steep forest land.
Betneen 1975 end l?B?, a diversion structure Has constructed above the subject
property, which keeps these two drainageways 3eparate. East Mill Creek
discharges into Gore Creek ebout l r?00 feet east of the confluence of t'lest
l,lil I Creek and Gore Creek. Above Gore Creek for about t/? nile the area is
residential.
All runoff from lot t0 drains into lJest l'lill Creek. The FEf'lA study identifies
the floodplain on lot 10, ranging from 15 to ?5 foot width.
V. FLOOD CSITRq. CRITERIA
The applicable drainage and floodplain nap for this area of Vail is the 198?
FEttA REP0RT. The design discharge nes taken from Table I in the t98a FEf'lA
REPORT. These values are gufinarized below3
Locat ion
tlest llill Cr
10-year
105
Peak Discharges (CFS)
50-year 1OO-year 500-Year
130 150 e30
The channet nas sized to carry the 100 year flows nith I foot ninimum
freeboard and to contain the 500 year flows rithin the banks. The channel
alignment r*as determined by using a ninimum centerline curve radius of 43 feet
rtriitr is equal to or greater than tro times the top-nidth at the lQO-year flow
clepth.
The channel is designed with rock check drop structures and rock lining in the
invert portions of the channel. The check drops reduce the overal I slope of
the chennel and therefor the crosive velocities. The drops also create smal I
poolr, rhich collect sedinent from the channel creeted by its construction, in
rddition to providing vi5u.l amenities. The rock lining in the invert
provides additional protection against erosion during the normal base florrE in
the creek.
At the outlet of the 60" RCP, a stilling basin is to be crctted fron the rock
drop structure. This basin will dissipate the energy of the high velocity
sulvert discharge and rill also collect some sedinent.
Ett,li0ilrErrAt lltPml ntPoRT PATE I
Sediment will collect in the stilling basin and other pools created by the
rock drop structures. This sedinent nay need to be renoved at eome time in
the future if the aesthetic value of the pools are to be naintained. This
rediment, horeverr will not effect the hydraulic characteristics of the
channe I .
VI. DRAII96E FACILITY SITE PLSI
Figure ? presents E site Plan of the proposed
from the site near the house will be flow
elong e sxale by the house.
channel al ignnent. The drainage
north and east towards the creek
The required building setback from the centerline of the creek is 30 feet.
This setback iE identified on Figure ?.
VII. REEII-ATffiY RSOTJIRE}€NT5
The applicable drainage and floodplain plan is the lgBe FEHA REP0RT. The Vail
Hazard Regulations of 9-3-BS apply in regard to hazard issues. lJnder the
Clean !'later Act, a Section 404 or Nationwide permit may be required by the
Army Corps of Engineers. The State Department of Health nray require a 401
certification, which roould coincide with the Federal 404 permit. Information
has been sent to the regional office in 6rand Junction to deternine if the
project will fall under the Nationwide Pernit or tlill require an individual
404 pernit.
The Hazard Regulations, Section 18.69.05a titled Special Restrictions for
Developoent in 6eologically Sensitive Areas, address hazards associated *ith
debris flow areas. These restrictions aPply on a site-Epecific basis.
VIII. ENI/TRIIIIGNTAL II$/ENTffiY RND }NZARDS TF PRESENT SITE
A. lnventory
Figure 3 presents a set of photographs taken of the channel area within lot 10
block 1 on l'larch ?7, 1981 . These photographs show the location and condition
of the Creek, the proximity of the houses and the ninter vegetation.
B. Envlrornrnt.l Hrrrrdt
l.lithin the Town of Vail environnental hazards regulationsr there are three
special restrictions for developrnent in geologically sensitive arFaE! debris
flow and debris avalanches, rockfal I areas, and general geological hazards.
Based On conversations with the Town Planning Departrnent, Lot 10, Block t Vail
Villege Filing I does not lie rithin a rock fall zone. Infornation on the
geologic sensitivity of the site was not aveilable from the Town rt the tine
this report Has prepared. The Property is nithin the debris flow and
avalanche area, which is disCUsed below, and a flood hazard area, rhich as
previously d i scussed .
ETI|IRIIIIIIEIITAL IIIPACT REP(lf,I PA6E 3
o
II. POSSIBLE EIIVIRIIITNTA. I}fACIE
A. Debrir Flot tnd lle0rlr Avelrtther
As pert of the investigation into the hydreulic conditions of l,lest ilill Creek'
Hright l,later Engineers, Inc. learned that the existing structure on lot 10
.block I on l.lill Creek Circle is wlthin the moderate hazard erea for debris
flor. Thir hazard lrea reE identified end defined by Arthur I. l'learsr P.E.t
lnc. in the rcport Drbrlr Flor rnd Drbrlr Avrlrnchr Hrzrrd Anrlyrlr prepared
for the Town of Veil, dated Novernber 1984. A noderate hazard debris flow area
is defined in the report as:
'Arur rubJrct to lon-rnrrgy floru rnd drbrlr flooding. llodrrrte
hprct rnd drpotltlonel lordt rnrbh fmrlblr conrtructlon of r
rtde vrrlrty of rtructural-drfrnn ltuurlt...Thur .rt.t crn
rxprrlurr proprty drnrgr through floodlr4r rroflon .nd lilPrct of
ruddy nrttr roll, rockl rnd dtbrtr.'
tJright l.later Engineers, Inc. did not undertake any studies to identify or
define the debris floH hazards for the sitet but relied upon existing
infornation described above. Additionally, no debris defense measures uPre
requested or incorporated into the hydrological design of the real ignment.
tJl,,fE believes that by al lowing a structure to be placed closer to the existinq
tlest l'li I I Creek al ignment, there is the potential that the ner{ gtructure would
be subject to increased debris hazard potential, because it rould be more in
direct line Hith the flow fron lJest f.li I I Creek above the site. Howeverr l,,ltlE
has not underteken studies to nake this deternination or to identify what
affects, if any, the realigned creek would heve on debris flow.
S. Storr Runoff Ererter Than Derign
The proposed creek al ignment and crosg section are designed to carry the storm
runoff from the 500-year storn event. In the case of nore a Eevere storm with
greater discharges or due to blockage of the existing 60" RCPr there is the
possibility of darnage occurring frorn the discharge exceeding the capacity of
the channel or fron overtopping of the l'till Creek Circle. Due to the local
terrain, the flows nould sPread out as shal lon flow and neander through the
property, Because the proposed structure is closer to the original creek
location and in nore direct line with the upstream creek, flooding of the
structure is posr ib le.
C. Conrtructlon Rrlrtrd Sedtrent
Construction of a nen channel ney provide a gource of edditionel sedinent.
Scdirnent sources rill be fron the actual congtruction of the ncn channel and
from the chennel itself, until a stable condition is reached over time. This
procees nill be rcduced by the use of rock lining in erosivl ereas of the
channel. tn addition, the snal I poolr created by the rock drops rill help to
cotlect the sedinent until the channel hrs a chance to stebilize.
ETIIIf,||TITEXIAL IIIPACI R[PllRT PA6E {
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HGLAE 3
VIEW DOWIISTREAIUI FROM MLL CREtr( CIRC[E
vtEl,tt DowNsrREA[l FROttl ]t[DDtE OF LOT 10
! rNFoRr{ArroN P^PER t
NATIONWIDE GENERAL PERI{IT TIUI{BER 25
HORK AAOVE HEADHATERS AI{D IN ISOLATED T'ATERS AND I|ETLA}IDS
A natlonwlde general pernlt ts a Department of the Army pernlt that ts tssued on a nattonvlde basts for a gpeclflc -ategory of actlvltles that arc cubstanttally glntlar and cause
ntnlnral cnvtronnental tnpacts. Nattonvlde perntts ere deslgned to allov the uork to occur ulth ltttle delay or paperwork. An
tndtvldual pernlt appltcatlon ls not rcgutrcd for rn ectlvlty
covered by a natlonvlde pcrnlt
Thc Corps of Engineers has tssued a nattonwlde gernlt for placlng dredged or ftll natertal tn the folloutng uatere:
l. Non-ttdal rlvera, streams, and thetr lmpoundnents,
lncludlng adjacent uetlands that are located above the
headvaterg. The headvater ts deftned as a potnt on a non-tldal gtrean uherc the average ennual flow ts less than 5 cublc feet per aecond.
2. leolated, non-ttdal vatcrs ol the Unlted States,
lncludlng uetlands, that are not part of a gurface trtbutary
system to lnterstaLe vaters or navtgable waters of the Untted I Etates "5--b ..}
Thls natlonulde general perntt ellnlnates the need for
grocesslng for dtscharges uhlch eftcct less than I rcrc of the
ebove vaterg of the Unltcdl States, tncludllng vetlands
EXCEPTION - Those dlscharges vhlch cause the losc or gubstanttal
adverse nodllflcatton of 10 acres or note of the above uaters ol
the Untted States, tncludlng uetlands are not permttted under thtg natlonvtde pernlt.
",
NOTTFICATION PROCEDURES - For dlscharges vhtch cause the loss or ;i gubstanttal edverse nodlftcatlon of I to 10 lctes of the above
vaters of the Untted States, lncludlng uetlands, the Dtstrlct
Englneer nust be nottfted before beglnnlng uork. Dlotlftcatton nust lnclude the folloulng tntornatlon:
1. llame, addrcsg anlt phone nunber of the nationwlde
pernl ttee.
2. l,ocatton of tbe planned vork (complete vrttten
descrtptton or tndtcated on a good gualtty !taP, c.9., USGS
topogrephlc quadrangle) .
3. Brlcf descrtptlon of thc Aropoaed uotk, lts purposc and
egproxlnatc lrca of ueters (tncludtng vetlands) that vogld be
adtvcraely affccted ts ! acsult of thc progoceal vork.
l. Coplcs of other fcderal, atate or local pcrmtts and
ccrttflcatlons obtatncdl for the ProPogetl uork.
1
.-
=vi vl
5. Any othcl lnfornatlon that thc pcrmlttee bclteves ls
eppropt latc.
THE NATIONTIDE PERMITTEE SHALL NOT EEGIN $ORK:
1. Unttl notlfted by the Dtstrtet Englneer that the uork :
may psoccedl under the natlonrtde perntt; or
2. Unttl en tndlvtdual pcrntt ls obtalncd (tf the Dlvlston
EnElnecr detcrnlnes that the natlonvlde permlt vlll not apply);
ot
3. Untll 20 days havc assed fron recclpt of the
pernlttcefs notlflcatlon by thc Dlstrtct Englneer and nottcc has
not been rccetved fron thc Dlgtrtct Englneer.
The cncloscdt tpectal condttlons nust be folloued ln ordcr for
thls nattonwld- permlt to be valld.
FOR HORE INFORI{ATION, gRIrE TO tHE GRN{D JUNCTION REGULAIORY
oFFrcE, u. 5. tRtff, CORPS OF ENGTNEERS, SACRAXENIO DISTRTCT, ?61
HORIZOit DRr\rE, ROOII 211, GRNID JUNCTION, COLgRADO EI506-8?19 OR
TELEPHONE (303) 213-1199.
I Enclosure
as ctatcd
2
t INFORI{ATION PTPER
NATIONWIDE GENERAL PERI{ITS
UESTERN COLORTDO
A. SPECIAL CONDITIONS.
folloved in order for the
The follovlng rpeclal condltlons nust be
nattonvtdc pcrnlts to be valtdl:
1. That eny dtscharge of dredged or flll rnaterlal wtll not
occut tn the proxlurlty of r publtc watcr aupply lntake.
2. That rny dtacharge of dredgeil or flll materlal vtll not
occur tn areas of concentratedl chellflgh prodluctton unless the
dlscharge ls dtrectly rclatcd to a shellflsh harvestlng acttvtty.
3. That the actlvlty utll not JcoPardlze a threatened or
cndangered ageclcs es ldenttflcd undcr the Endangered Speclcs
Act, or destroy or advetsely rnodlfy the crttlcal habltat of such
specles.
l. That the acttvlty chall not algnlftcantly dtarupt the
novenent of those apecles of aguattc llfe lndlgenous to the
uaterbody (unless the prlnary PulPose of the ftll ls to lupound
yater ) .
5. That any dlscharge of dredgedt or ftll natertal ahal'l
conslct of sultable naterlal free of toxlc pollutants ln toxts
rmount6.
6. That any structulc or flll authortzedl shall be properly
na I ntr Inedt .
7. lhat the rcttvtty wtlt not occur ln e component of the
lfatlonal tlld and Scenlc Rlver Systen; nol tn a rtver offtclally
destgnatedt by Congress as a ietudy ttvcr' for posslble tncluslon
tn the aystem, whlle the rlver ls tn an offlctal rtudy status.
8. That the actlvtty ghall n'ot ceucc an unaccepteble
lnterfcrcncc vtth navtgatton.
9. That, If the actlvlty nay.dvctsely affect htstorlc
propertles vhlch the Natlonal Parh Servtcc has tlsted on, or
detcrnined cltglble for llgtlng on, thc Natlonel Rcglstcr of
Htstortc Places, the Perrnlttee rtll notlly the dtstrlct cnglneer.
lf the dlstrtct Gnglncer dctcrnlnes thet cuch htatortc properttcs
nay bc edvercely effectcd, he vtll grovlde the Mvlcory Counctl
on Htstorlc Preservatlon en opportunlty to conuuent on the etfecta
on such htstortc propertles or he vlll constdcr aodtflcatton,
suapenston, or revocatlon ln eccordancc vlth 33 CFR 325.7.
Furthcrmore, thaty lf the pernlttce bctore or durlng prosecutlon
of thc vork euthottzcdl, encountsrs e htctortc ropcrty that has
not bcen ltctcd on the llattonal Rcglstcr, but rhlch nay be
cltglble tor llatlng ln the Natlonal Regtster, hc shlll
lnncdtately notlfy the dtstrtct cngtnecr.
1
', O,
10. that the.constructlon or operetlon .i the acttvlty wl 1l
not tmpalr reservcd trtbal rtghts, tncludllng, but not llnlted to,
reservld vater rtghts and treaty ftshlng and hunttng rlghts.
11. That the ecttvtty wlIl comply wlth rcglonal condltlone
uhlch may have been added by the dl.vlslon cnglncer (None have
been added for vestern Colorado)
12. ?hat the rnenagenent practtces ltated belov shall be
follovedt to the maxlrnum extent practtcable.
E. HN{AGEI{ENT PRACTIcEs. In addltton to thc condttlons
apecffiE6ve-, the follortng nanagenent_Practtccs ahall be
filloved, to thi naxtmum extent practlcable, tn order to mlntmtze
the adveise effects of these dlscharges on the aguatlc
envlronnent. Fallure to conply wlth thcse prectlces nay be cause
for the dlstrlct englneer to teconmend, or the dtvtslon cngineer
to take, dlscrettonary authorlty to rcaulate the actlvtty on an
lndlvldual or rcalonal baslg.
1. Dlscharges of dreilged or ftll rnaterlal tnto Yatels of
the Untted Statei ghall be avotded or nlnlnlzed through the use
of other praetlcable alternatlves.
2. Dlscharges tn spawnlng areas durtng spawnlng seasons
shall be avolded.
3. Dtscharges ghall not restrtct or tnrpede the novement of
aguattc spccles indlgenous to the uaterg or the ptssage of norrnat
oi cxpectla nfgfr floys or cause the relocatlon of the water
(unleis the primary putpose of the flll le to lnpound vaters.)
l. lf the dlscharge creates an tnpoundment of uater,
ldverse lmgacts on the iquattc systen saused by_the accclerated
prssage of-uater and/or the restilctlon of tts flovs ghall be
nlnlmlzed
5. Dlacharges ln vetlands arcas shall bc avolded'
6.Heavycgulgmentuorklnglnyetlandsshallbeplacedon
nats.
7. Dlscharges lnto breedttng areas for nlgratory vatertoul
chall be evolded.
8. All temporary ftlls ghafl be temovedl tn thelr cntlrety.
C. FURTHER INFOR}IATION.
l. Dlstrict bnglneers
actlvtty compllcs Ylth the pernlt unlcss that declslon
cngtnecr.
are ruthortzcd to dcternlne lf en
terrrs and condltlons of a nettonvlde
nust be rnede bY the dlvtslon
do not obvlate the needl to obtatn 2. Nattonvlde Permlts
.''1
','t:ll
ott", r"acrat, rO or locat euthortzatronrLqutrcdt by law.
,' l. Natlonntde permtts do not grant any PloPerty rlghts or
cxclustve PrlvtlcAcs.
l. Nattowlde permtta do not authorlzc any lnJury to the
property or rtghts of otherg
5. Natlonulde permlts do not authorlze lnterfercnce wlth
eny exlsttng or progoscd Fcderel Projcct
FOR IIORE INFORI{ATION ON THE NATIONWIDE GENERAI PERMITS IN CESTERN
COLORADO, TRITE TO ?HE GRAND JUNCTION REGULTTORY OFFICE, U. S.
lRl{t, coRPs oF ENGINEERS' SACRAI|ENIO DTSTRTCT, ?61 HORTZON DRrrtE,
ROOIi 211, GRAND JUNCTTON, COLORADO 81505-8719 OR TELEPHONE (303)
2r 3'1199
3
w'itht W.lcr Engincerr, Inc.
DENVET O'TICE
,a9 w6t 25th At'c., 9rh. td, A
Danvcr, Colotrdo t{1211
(S3).|tSu|D
Junc 14, 1990
GTENWOOD SPRINGS OfflCt
!18 Colorrdo Avcnuc
P. O. lor ll9
Glenwood sptin33, Colot.do E1@2
(303) 91t 7755
Dcnvcr Dlrect linc: !0l15(l0
lvlr. Philip Hoversten
1183 Cabin Circle Drive
Vail, Colorado E1627
Dcar Mr. Hoverstcn:
As we discussed on June 8, 1990, an inspecion of the construction of the relocated West
Mill Creek Channel was found to be necissary. You refused to authorize a final inspection
of the construction and, therefore, Wright Water Engineers performed it at it's own cost as
a matter of public interest.
The inspection was performed on June 10, 1990. The inspection rcPort is attached which
describes our frndings.
Please note that there is an apparent lack of an adequat€ Type I Filter layer under the
channel lining stones. Due to ihe potential sigruficaqge of_this irem we would suggesl that
if you do notiagree that the Type i Filter layCr should be instdled as designed you should
hive a qualifieiiprofessional jebtechnical engineer inspect the bedding and soil conditions.
Another itcm of special note is the lack of adequate $outing of the chute crests.
Other itcms primarily relare to stoncwork chiqlcilg,- adding stones in riprap holes, and
placement of derrick itones on a portion of the righi bank a-nd for a short distance on the
left bank. We also called for t*o bafflc stones in t-he channel near the 60 inch RCP outlet.
It is our opinion that since it aPPgq! that-the Town of Vail is.not going to require TEttlA
aoJrouat ih th" for;n of a CLOMR in order to issue thc Certificate of Occupancy for the
niiv residcnce on lnt 10 and since such approval is now moot since the channel has been
construaed without Wright Water Engineer;s being afforded any oppornr-nitylo observe th.at
construction, there appears to be no necessity to Pu_rsu-e-any further the obtalrung oI me
Cf.OftAn. Please let'rire know if you disagrei sinct I will take no further action in regard
to FEMA until I hear from You.
C,
Mr. Philip Horrersten
June 14, 1990
Page2
Wc re not ablc to approvc thc channcl at this timc and must inform you that the channel
is unsafe in its present condition, and will not function as dcsigrrcd. lt may fail at high
Oortr.
We are availablc to meet with you at your convenience.
Very truly yourq
WRIG}IT WATER ENGINEERS
cc Mr. Robert Gunn
BR/dat
891-022.000
,t
Chief En$heer
O,
R.EPORT ON CONSTRUCTION TNSPECTTOT'I
REL/OCA'-TED WEST MILL CREEK CHANNET
Lot lO nlock l. Vail VillaSe FilinS *t
Mill Crcek Circle. Vail. Colorado
Date of lnspection: Junc 10, 1990
By: William Ruzzo, P.E.
Dr. Ronald L Rossmiller, P.E.
Kennetb R. Wright, P.E.
On June 10, 1990, an irspcction of corutnrction was conducted subsequent 1o discussions
and correspondence with Mr. Phil Hoversten rcgarding necessity of an irupection and
subsequent to an earlier preliminary inspection by \ilright watcr Enginecrs on l{ai' 26'
1990.
Findings for the June 10, 1990 irspection are presented below. All refercnces to right or
lcft bank are tooking dowrstream. Thus, the right bank is eastcrly and the lefi bank is
westerly.
T}?e I Filter, 6-inch l:!'er
During rhe irspection it was notcd that the spccified Type I Filtcr in a six'inch layer under
stone and riprap was gencrally absent.
The filter laycr's purPose is to prevent washing out of fines under the riprap and stones'
It seles as an inverse filter. It also providcs a foundation for the riprap and stones'
InspeAion of matcrial under the stones on thc banls indicated that thc 3tones wcre resting
on nativc soil. In one tocation a 3-inch laycr of 3/a-inch crushed stone was found'
o q
-2.
Wgght Watcr Engincen is of thc opinion that tbe 6ltcr layer is neccssaqt, bowevcr, the
di6culty of rcmoviog stones for propcr placcment of tbe Tlpe I Filtcr leyer is a significant
Etttcr. tf Mr. Hoversten or Mr. Gunn disagrcc with rbc acccsity of tbc T19e I Filter
leyer, rbcy should coruutt with a quatified professional geotechnical enginccr.
Cress of tbe thrce chutes are specified to bc constructed of gtouted 3 to 5 foot derrick
$one underlain with Typc 2 Stone, all undcrlain by a Gincb layer of Tlpe I Filter'
The threc crcsts contain some derrick stonc, bul also substantial smaller sized stone. The
6csts do nor appear to be grouted as spccificd to their full depth and *'idth and for
approximately 2 fcet in a downstrcam dircction. kspcction of thc sides of the threc crests
rcsulred in finding a small amount of concrete on thc right sidc of the first and third crests
only.
An adequate Tlge 1 Filter layer of 6'inches thickness was not observed under the slone at
anv of the three crests.
, Channel Banks TWe 3 Stone. General
I Thc Type 3 Srone specified to form thc banks of the channel are to be a uniform size
from24 to 30 inches in size, resting on a 6-inch layer of T19e l Filter material.
Spaces were noted bctween T19e 3 Srone for a substandal Portion of the area of the banks'
Thc spaces shoutd bc filled with Tlpe 3 Srone and all stones suitably chinked to fill ani'
rcmaining spaces. smaller stones sbould be replaccd with Type 3 Stone.
The Tpe 3 Stone was nol adequately founded on a 6-inch laycr of Tlpe 1 Filtcr material
throughout the channel length.
t
.3-
Tbc prorposcd top of the bank in the vicinity of tbe north ProPcrty line of lat 10 was shoun
on rbe drawing as an elevation of 8Jl6 fecr with a channct bcd elcvation of approximately
$211 fcct.
Survcys indicate the following at thc Dorth property line:
Top l-cft Bar* ' 8213J fr"(Specified to bc 8116 fect)
Top Righr Bank - 8215.0 ft. (Specified to bc 8216 fcet)
Channel Bed '8,212 ft. (Spccified to bc 8311 feet)
The placemenr of stone on the righr bank was stopped four fcet south of the property line'
which is not in comPliance with specificatiors. Furthermore, the stone forming the banks
was not all Typc 3 Stonc of 24- to 3Ginch sizc specified'
Thc banla of the channel at the nonh ProPerty line and about 20 feet to the south should
be broughr uP to a suitable elevation, approximatcly to 8,217 feet. This is necessaD.
because the channel bed elevation specified was cxceeded by one foot'
A row of S-foot stone should be placed at tbe lcft bar* commencing at the north proPerq'
linc for a distance ro the south of twenty fcet. Thc stone would provide a suitable bank
ro protect the poolhousc. The cxisting small sized slone on the tefi bank would be used as
the toe for thc new 5 foot diameter srone. AII stone on ttre lcft bank in this area should
be suitablY chinked and grouted'
Tbcrighrbar*stoneplaccmcntshouldbcTypc3Stoneasspecifiedtothenecessary
etcvation to tie in with tbe southerly right bank'
Thisponionofthechannel,attbedownstreamcnd,isclosetoitsoriginatshapeand
capacitywhicbisnotadequatetoPreventfloodingofthepoolhouseandwaterexitingthe
.t; .
5:,
t
t
.4-
c.brnncl would 0on, to tbc Dortltrest. tt w8s tbc lntcntion of thc ncw c.banncl to climinate
Oc orcrtlor uca The original ruwcy of t.ot t0 drorred a rctaining wall in this Potential
ovedlon, rrca
The top of righr bank, on thc ouSide of the qrrve, is bclow tbe proposed top of bank
clevation. To correcl this a ron' of dcnick stone should bc placcd dong the top of the right
bar* from a location bcgrnning 10 feet upstream of Crest #Zfor a distance of forty feet in
a dowrstream direction. Tbc derrick stone shoutd bc foundcd on Type 1 Filtcr l:yer and
set approximarely lt-iuches inro thc ground. Tbc dcnick stone should bc four foot
minimum sizc and ertend from tcn fcet upstream of Gest #2 in a northerly direction to
Crest #3.
The June 10, 1990 irupection noted the following in the channel constnraion in the area
from Crest #1 upstream lo the outlet of the 6Ginch RCP:
A targe hole exists in the Type 3 Stone bank immediately to the left of the
RCP outlet. Tbe hole should bc filled with T19e 3 Stone'
There is a lack of Tlpe 3 Stone on the right bank from the RCP outlet for
a distance of 12 feet to the north. This is an cxisting willow area.
Tbe highcr vetociry flow out of the 6sinch RCP should have additionel
cner$r dissipation. A new 4-foot stone should be set into the channel bottom
immediatcly dowrsrream of the existing 3$inch slone utd to thc lefl of the
RCP centcrline. A second new 4-foot stone should be sct into thc channel
o
o
I
-5-
bonom rn edditional 5 fect domstream, iut to Oc right of the RCP
G?nter[nc. This rccood new stone locrtionwould be innrcdirtcly doumstrcam
of tbe cxisting large 6foot sizc right bat* rtone
Toestrbtisb a nritable right bank in licu of rcmoving the cxisting willors, a linc of S'foot
size denick stonc sbould be set partidly into tbe ground cast of the willows and carried
downstream to a point 5 fecr donasueam of the Oest #1. This rorr of denick stonc would
rie into the cxisting largc 6foot stonc on the right bank.
Two stones on the right sidc of Crcst #1 would be rcmovcd prior ro grouting of the crest.
Care should be talcn that this Crcst #1 clevation does not projca above that called for'
Any such variation in clevation should bc belop the specified inven clevation ro proride
additional frecboard.
Rock Crest No. 2
The righr bank srone immediarely upstream of Crcst No. 2 contains undersized stone'
These stones should be replaccd with Tlpc 3 Stone on a Typc 1 Filter layer.
Immediarely do\{nstream of Crest No. 2 on the right bank a large srone has been placed
which obstruds thc flow and which may cause water to be defleocd improperly. It should
be removcd.
Optional RiSht Bank Stone
Two sections of right bar* derrick stoncs on tbe top of tbe right banl havc been called for;
from Gcst #3 to bcyond Crcst #2; and from near Crest #l to the 6$incb RCP oudet' For
continuity and appearance it is oPtional to conncct the two sectiotts, tbc diswce being
approximatcly that of 4 or 5 additiond stcnes.
,'i
;-
o,
.6-
UDetrcem 6Ginch RCP
Tbc problcm of plugging of thc 6}inch RC" with rock and debris has bcen presented to
rbe Toum of Vail in 19t9 by Wright Water Engincers in tbe cm'ironmental assesment. The
Cotoredo \Patcr Coascrvatioa Board iadependently notified the To*a of Vail of the area-
widc dcbris problcm in August of 1989. The lflright Watcr Engineer's drawing stated that
the dcbris problcm cxisted. Tbc WWE drawingp dso statcd tbat thc dcsign flood n'ill
oycrlop the Mill Oeek Circle Road wi$ or without the channel realignment
Wc understand that tbe Colorado State Geologist has in the past notificd Vail authorities
of the bazard. Further, we understand that thc State Gcologist dso notified the Secret
Scrvicc of the hazard at the time tbat President Ford temporarily rcsidcd in tbe Mill Creek
Circle arca.
On June 10, 1990 the cntrance of the 60" RCP, upstream of lrt # 10, was Partially plugged
ro a deprh of 2.5 to 3 feet with a flow of about 30 cfs. The cntrance was similarly plugged
on May 26,1990.
During high runoff evenrs tbc culvcn will substantially plug from upstrcam activities. The
qrlvcrt will carry little or no flow.
Wc fcct thar alt agencies have been notified of this potcntial. It is be important that you
notify the new purchascr of lot #10 of the debris and flow hazard.
Duc ro the potential Mill Crcek Circte road overtopping, cven without RCP plugging' the
1982 0oodptain delincation by FEMA and is usc for floodplain zoning PurPoses may be
in error. It is likely rhat floodwaler, oncc it has left tbc channel, will flow westerly do\rn
Mill Crcck Circlc which slopes 1o the wcst.
o
I
-7-
Ilc restdens of Mill Gccls Circlc should bc nrdc rwrrc of the dcbris rnd 0ood question
Fe"d lD fhis rrca Routine 0ood proofing of rcridcnc?s would rssbt romcwhat in
nitfatiag the potential hazards from ordinary o'crftor*t from upstrcam duc to dcbris flow.
Channel Bcd
Due to rhe significant tlol of Wcsr Mill Oeck on May 25 and June 10, 1990 Wright Water
Engineers was uoable to inspeA thc bcd of thc relocated cbannel. Wc will bc available
to do so whcn the flow subsides or if thc full 00w would be divertcd to the East Mill crcek
bypass channcl.
tt was noted, bowever, that some bcdload rocks of 2 to 6 incb sizc bavc depositcd in the
upper portion of the new channel. Maintenancc of thc channel combined with monitoring
of dcposition in thc future will be necessary to avoid Potential excessive deposition of
bedload.
Appearance
The aesthetics of the ncw channel arc good. A high dcgrec of roughness in the cluster
crcates turbulcncc for this full lcngth as wcll as timiting velocity in the drops' Tbe
survitinear plain of the channet provides a mote naturat aPpearancc than a straight
alignment.
Thc incorporation of drops satisfies the rcqucsl of thc U.S. Army Corps of Engineers' The
va,rying profilc of tbe channcl provides a series of rifilcs and pools which arc ofien
rssociatcd with mountain streams'
During rbe reworking of the rctocared west Mill crcck ctrannel cnginecn from wright
water Engineers should bc called in to advise on work and to obsclc it as it is being
performcd.
o o
)
.8-
EDdirs!
Ttc rclocatsd chamcl of West Mill Geek on I.oJ t0 of Block 1 of Vail Villagc Filing No.
I ir not nritabte for acceptancc by \f,right Watcr Engincers; and duc to thc corstruction
ioadequacies urd failurc to follol Wright lVatcr Engincer's dcsign il is our opinion that
rbc channcl is unsafc, it will not function as dcsigncd rnd may fail bccause of its prcsent
lack of stability.
KRW/dat
891-022.000
TO:
FROM:
DATE:
SUBJECT:
MEMORANDUM
The File
Mike Mollica
October 30, 1992
Lot 10, Block 1, Vail Village Filing Number One
Wright Water Engineers indicated in a letter sent to the Town (dated July 3, 1990), that in their
opinion "the channel design and construction satisfy ths request of the U.S. Army Corps of
Engineers regarding the #404 Permit." Based upon this information the Town issued
a final Certificate of Occupancy for this redevelopment on July 12, 1990. The property was
subsequently sold to Steven J. Redding and Angelina C. Redding of Santa Babara,
California.
After the final Certificate of Occupancy was issued, the Federal Emergency Management
Agency (FEMA) notified the Town that one condition of the original approval had not been
fulfilled to their satisfaction. The final step in the FEMA approval process, which is technically
called a Letter Of Map Revision, has never been completed. The Town has, on numerous
occasions, contacted the property owners to request that they obtain the Letter Of Map
Revision. The current property owners have been unwilling to spend any lunds to obtain this
approvalfrom FEMA.
No future requests shall be processed through lhe Communlty Development
Department, nor shall any approvals be granted, for thls property untll thls lssue ls
resolved. lf a planner handling any application for this prFty should need any additional
information, please see Mike Mollica or Andy Knudtsen. t
Kristan Pritz
Engineers, Inc.
w
Wright Water
DENVER OIFICE
2490 West 26th Ave., Suite 100 A
Denver, Colorado 80211
(303) ,t80-1700
May 20,199L
CLENWOOD SPRINGS OFFICE
818 Colorado Avenue
P. O. Box 219
Glenwood Springs, Colorado 81602
ln3l 945-7755
Denver Direct Line: 893-1608
Mr. Andy Knudtsen
Town of Vail
75 S. Frontage
Vail, CO 81657
Re: ht 10, Block 1
Dear Mr. Knudtsen:
Wright Water Engineers (WWE) has reviewed its file on the subject channel assignment.
Copies of pertinent correspondence are attached.
It is clear that an "as-built" drawing was never undertaken. The client for whom we worked
did not authorize an as-built drawing.
The original CI-OMR application was moot early on because the channel was built before
it was finally reviewed by FEMA. To help avoid unnecessary delays to the residence
completion, WWE, on it's own, did extensive field checks of flow and current patterns in the
channel, made engineering computations and submitted extensive datapackages to the Town
of Vail and FEMA. FEMA has now requested an as-built drawing; however, none exists
at this time.
It would be a fair question for you to ask the authorities whether or not a CLOMR is
needed considering that:
1. The original n*r"nfff ,ffJ io;igilire not in the desigrrated floodplain.
2. The relocated channel is entirely limited to lot 10. It begins and ends on lot
10.
The original FIRM did not consider debris flow on West Mill Creek and,
therefore, is subject to question.
The Town of Vail culvert under West Mill Creek Drive could not be expected
to function adequately during a flood because of rocks and debris pluggtng
its inlet.
3.
4.
Mr. Andy Knudtsen
May 20, 1991
PageZ
5. A system of flood proofing, suitable for debris flow, should be implemented
on West Mill Creek. John Rold, the State geologist, has previously identified
debris flow problems there.
6. The CLOMR was a condition of approval for the channel change and new
residential construction on the lot. However, the CLOMR was moot at an
early date. FEMA does not issue a CLOMR for a channel change already
constructed. After constructio& one needs a LOMR. I doubt that the Vail
conditicin of approval mentioned a LOMR, but only a CI,OMR.
7. You could request that FEMA undertake a new FIRM which would consider
the effects of debris flow, a plugged culvert, and other physical phenomena
which might cast some flood water to the west down West Mill Creek Drive,
away from the relocated channel.
If WWE can be of assistance on this matter, please let us know. We are in a position to
handle the as-built drawing preparation which would include a field survey coupled with a
formal plan and profile drawing for submittal to FEMA. Our drawing would include the
field-determined roughness factor, hydraulic slopes and other technical data of interest to
the FEMA reviewers.
Very truly yours,
WRIGHT WATER ENGII{EERS. INC.
President
KRW/scs
(Corres\LGunlt 10.KRW)
891-022.ffi
{-fl $\.
75 soulh fronlage road
Yail. colorado 81657
(303) 47$2138
(303) 47$.2139
office of community development
May 6, 1991
Steven J. Redding and
Angelina C. Redding, Trustees
P.O. Box 1274
Santa Barbara, California 931 17
Re: Lot 10, Block 1, Vall Vlllage Flrst Flllng
Dear Mr. Redding and Ms. Redding:
We understand that you are the current owners of the above referenced lot. The existing
residence on this lot was constructed after the Town of Vail approved variance requests to
build a portion of the structure in the front yard setback and to modify the 1OO-year flood plain.
The variances were approved by the Town Planning and Environmental Commission on April
24, 1989, and Town Council on May 16, 1989, with three conditions:
1. That a permit from the Army Corps of Engineers, either an individual or a nation-wide
permit, be obtained prior to the issuance of any building permit for the property.
2. That approval lrom the Federal Emergency Management Agenry (FEMA) be secured
prior to the issuance ol a Temporary Certificate of Occupancy lor the property.
3. That a ground water analysis be completed as an addendum to the ElR, prior to the
issuance of any building permit for the property.
The first and third conditions of approval have been fulfilled. lt is the second condition of
approvalwhich concems the Town at this time. From discussions with individuals with FEMA,
we understand thal lhe "approval" refered to in the second condition is technically called a
Letter of Map Revision (LOMR).
May 6, 1991
" P4e2
For your information, I wlll provide you with some background history on this property and the
associated variances. In the Town's file relating to your variance request, there is a letter
from Wright Water Engineers addressing all of lhe conditions of approval. Please see the
enclosed. lt is dated May 16, 1989, which is the date of the Council hearing when the request
rsceived final Town approval. Staff believes the Council's actions were based on the i-
documentation regarding tho first and third condilions of approval. Concerning the second
condition ol approval, Wright Water Engineers r€presents that:
'WWE has met with the Director of Region Vlll FEMA regarding the proposed channel
relocation. A report is being prepared to obtain a conditional Letter of Map Revision
(LOMR), which would revise the boundaries of the llood plain. A conditional letter is
required, since he ctannel has not been constructed at the time of the submittal. A
final LOMR would be issued @ that the channel was
constructed in accordance with the approved conditional LOMR submittal." (Emphasis
added by Town)
In order lor you to comply with the second condition it is imperative the Town and FEMA
receive the required documentation.
The Town planning staff has been working with FEMA and Wright Water Engineers
concerning this outstanding issue. Wright Water Engineers has provided letters stating that
the channel has been built in compliance with the design, but they have not provided the "as-
builb,'a specific FEMA requirement. Because the information submitted by Wright Water
Engineers to date is insutficient, and because Wright Waler Engineers has said they cannot
complete the required documentation without further authorization from the property owner,
the Town is contacting you directly to help resolve this situation.
Because adhering to the federal standards for flood plain regulations is a high priority for the
Town, lhe Town staff is very concemed that lhe projecl comply with the approval as soon as
possible. Since non-compliance may jeopardize other flood insurance policy holders in the
Town of Vail, the importance ol linishing the approval process is critical. In addition, because
the Town must ensure that property owners adhere to all conditions of approval, the Town
must require hat the final condition of approval be resolved.
Please call either of us at 303/479-2138 so that we can discuss this further and lay out a plan
of action to resolve this problem. The staff wishes to work with you to remedy this situation.
Thank you for your cooperation and attention to this matter.
Sincerely,
' Mr. Redding and lv[s. R.f,g
rtlJ< 14,(L 4'#-' .
Mike Mollica
Senior Planner
lab
Enclosure cc: Phillip Hoverslon
Wright Water Engineers
Larry Esltwittr
Town Planner
Jim Morter
Ron Phillips
Robert and Francis Gunn
wrltht Water Entinccrt, Inc.
DENVER OFTICE
2,190 Wett 26rh Avc', Suite 100 A
Denver, Colorado 80zll
(303) 4E0-17m
TUrSA oFflcE
2gl Wc5t
'th
St., Suite 1:10
Tulsa, Oklahona 7'1103
{918) 58+n36
GLENWOOD SPRINGS OFFICE
E18 Colorado Avcnuc
tno"*t"o}l|r' "ar,
coloredo E1 602
(303) 94t7755
benver Direct Llne: 893'160E
t'lay 16r l9B9
Mr. I'lichael l'lollica
Town of Vail
?5 S. Frontage Road
Vail, CU 81657
RE: Gunn Property - I'lill Creek Circle
Dear l'lr . Mollica:
tn the Planning CommisEions approval of the request for-zoning variance for
the Gunn Propertyt three items requirinq additional information Here
identified. Out- '"'pon'e to theEe items is presented herein'
1. LSACE Section 404 Peroit' A nationwide germit has been obtained fron
the us Army Eorps of Engineert toi 'lit tit"' A coPv is enclosed for
your files. ii.'-r"gq"riions.,nade uv'ti"--uiecE have been incorporated
into tn" design of the channel '
?. FEIIA Ftood Plain l|odification. '. |||l,|E ha' mei with the Director of Region
VIII FEIIA regarding the proposed ttt"in"f relocation' A report is being
prepared to ";;;;;'
'" -lonlitio''"r ;;il; of llap Revision (L0rlR) ' which
would revise ihe boundaries of *'e--iiooopiain.' A. conditional letter is
reguired,,in."-ti"channelhaEnotu."i-ton't'uctid.atthetimeofthe
submittal. A final LoMR would b" i=;;; ;it;t subrnitting documentation
that the channel }{as constructed in accordance e''ith the approveo
conditional L0l1R subrnittal' "
tle would like to notet howevert that the proposed structure wosld not
encroach into the existing-floodplain limitE as 'currently
regulated'
Therefore, the Town of Vail ,o"ii-p'ouiurv not jeopardize its flood
insurance Proeran status if thev ;;;t;;il;'q5:j::l-:ithout a letter of
nap revision'- Hovrever' r{e are- pullui"e a LbHR b:t:r1t" the floodplain
will change' even though tr.. ct,a.ql.i"l io-inpa.t beyond the linits of
the 6unn ProPertY '
3.Erourdrrtrrtrwrttgrtion.t.|!qhsginvestigatedtheeffectofthe
channel '"ro..lill.oi_ tt'" e'o.,,,o,.ili r."ei'. J,|e.have concluded th.t
the relocati"i"|{iir-i"r-"J"lti.rv--;;t;l iia ground'ater levels bevond
thelinitEoftheproperty.Detail-soi-ir'"enilysisercattached.
nrnanrndrrn +l +hi Dl rnn{ na - rnd Firrl r.hnnantr rJ,.rt'81onotr';i
llr. l,li ke l'lollice
f'lay l6r t?89
Page 2
If you require additional information, please contast us'
Respectful lY submitted t
MIS{T }IATER SF
tlilliarn P.
encl: 404 permi t
groundwater memo.
cc: R, 6unn
J. Morter
89l-oeP.000
By
Senior Project Engineer
.. r- "--- a1__2::=-=t=-==.:
TO: Federal Emergency Management Agency
DATE: ,July 26, 1989
RE: Lot 10, Block 1, Vail Village First Flling
To Wlrom It May Concern:
Please review Case No. 89-08-09R for a Conditional Letter of Map Revision. The request is to allow for the realignment of West Mill Creek as it bisects the above named lot in VaJ.l , colorado.
The Conditional Letter of Map Revision is one of ttre condltLons of approval reguired by the Town of VaLl prior to actural construction of the realignnent.
If you should have any questions, please feeL free to contact me at (303) 479-2L38.
Sincerely,
/?l-/< hrh-
Mlke Mollica '"i'.
Town Planner ' ' ''r '':
MM: Ir
o
Federal
I l'l W o ,A'W Emergency Manag
Washington, D.C.20472
(202) 646-3403
CEBTIFIED MAIL
RETURN RECEIPT REQUESTED
Dr. Ronald L. Rossmiller, P.E.
Senior Hydraulic Engineer
tfright lfater Engineers, Inc.
2490 Wesr 26ch Avenue, suite 100A
Denver, Colorado 8021f
Dear Dr. RosanilLeS
Ttris is in regard to your reguest for a revigion !o the Flood Insurance
llap and/or Flood Boundary and Floodway Hap for the referenced cornmunity.
preacceptance review indicateg that rre do not have t,he oinisun data se need
to begin our evsluation of your requegt. The required data are deacribed on
the encloged checklist and nu8E be gubnitted before ne can accept your
request. Unless otherwise directed by you in writing' we will keep the
submitted date in our files. tJe will not begin a detailed revien of the
subnitted data until we receive the requesEed data.
tlhen you vrite
(shogtr above)data, pLeaee
Contractor, at
8Eare.
Enclorure ' 1
cc:cdbr toaoreblc leo lore
Mayorl To n of Vail
III REPLY REPER TO!
65-PRE
Dates July 171 1990
Case Number: 90-08-42P
Re: lJest Mill Creek
Comuni ty: Torrn of Va i L ,
Colorado
John L.
Chief,
Federal
.\ (\1',..<c>TF
l{atticks ' \:
Rirk Studier Divicion
Ingurance Adninistration
to us about your request, please include the nes cage nunber
in your letter. If you have any questions about the requested
call l{ichael Bakere Jr., Inc., our Technicat Eveluation
(703) 838-0400, and ask for the Revisions coordinator for your
Sincerelyt
€
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Federal Emergency Manage
Washington, D.C.20+72
DATA REQUEST CHECKLTST
FLOOD INST'8AI{CB ST'ITDY (FIS)/FLOOD
BY LETTER OF I.IAP REVISION (LOMR)
Date! July 17, 1990
RequeEtor! Dr. Ronald L. Rossmiller, P.E.
Res lJest llil1 Creek
To help you prepare the required supporting
ne ere encloeing copies of the fotlowing:
o
me nt Agency
FOR REVISION TO
INSIJRAXCE RATE I{AP (FIR!{)
OR PHYSICAL MAP REVISIOTI
Coomunity: Town of Vail t
Co Lorado
Case Uunbers 90-08-42P
data for your revieion requestt
rh{ational Flood Insurance Progran and Relsted Regulationsrtl
deted October 1' 1989
Apoealg. Revisions. and Aaendment s !o Flood Insurence Maos. A
Guide for Conmunitv Officialsr dated January 1990
x rrConditiong and Criteria for Map Revieionar" dated Decenrber 30,
1985
ilConditions and Griteria for Floodway RevieionerI dated
August 27, L984
(other)
T:he date identified belon as ttRequiredtt Eult be aubnitted for our revien.
The data identified al ttReceived" chould not be reauboitted. References to
the gectioor of the f,ttional Flood Iorurence Prograo (NFIP) regulations that
eateblirh rgocific requirenen3s for luPporting data are included as
approgriate ia tbe checklist entrier. A11 anetyres subnitted oust be
certified by r rcgittcred profesrional engineer. Alt topograpbic data
suboitted Eott b. certified by a registered profeceionel engineer or liceosed
land surveyor. tbc neening of I'certificetiontr ar it applies to the typer of
required rupporting data is given in Paragraph 65.2(b) of the NFIP
regulations.
o o
(,r-a.. 0-+yor t'zo-?o /gt ' *'F,
+,1 il*t J'4 i' trla l"/4" k'*
h) .tP. ba 1i*cc+> wl l*' t,fli"r*:/
a*/ W o, fuk &tc u /'n'fr ffi
Sltrf s" P.^ Eoss^;/Lr
-fl,l l,,h c.re .'*uJ rX- P/^-'''r,/
Ar.^ u,,/ k->o -?o
Ea;/ L n:// A'*1 /+a*t;'1s /' * '
Faltt n^t1 & n /,r4 t *J f'L-
ad fru'lh hl ft* ;, "dxtl, a h
\Jrs-,FO
?
d'/K
0r. '
Description of Data
l. A concise description of the nature and extent'
of the requested revi s i on.
2. Evidence chat t.he Chief Executive Officer (CEO)
of the affected conntunity, or en official
designated by the CEO, was asked to submit the
revision request. (see Section 65.4 of the
NFIP regulations.)
3. A general description of the changed hydrotogic
conditions on which the revision request is
based. (see Paragraph 65.6(c)(r)(i) of the
NFIP regulations. )
4. A general descripcion of the changed hydraulic
conditions, including channel modificacions or
other projects, on which the revision request
is based. (see Paragraph 65.5(c)(2)(i) of the
NFIP regulations. )
Reouired Received
5. New hydrologic
descripcion of
analysis, including a brief
the methodology u3edr for Ehe
-year flood(s) for
6.
7.
Evidence
Federal
chst
agency
the appropriate localr SEater or
(i.e.t
f tras approvea the nel'
result ing including the hydroLogic anaLysis t
peak discharge values.
the ftood profiles shown for
in the effective FIS report.
Printouts (inctuding ful1 input and oucput
listings) fron a calibration nodelr produced by
the requestorr that dupticates the hydraulic
cooputer nodel used to determine the
-
-year watet-surf ace elevat ions shottn f or
-fr t ive
FIRlt. (See Paragraph 65.6(e)(8) of the NFIP
regulatione.) The calibration nodel nay be
either the FIS Model , reproduced on the
requestorts equipnent, or a nodei. thac yielde
computed rrater-surface profiLes that duplicate
Paragraph
regulacions. )
DescrioLion of DaEa
8. Printouts (including full input and output
tistings) from a celibration model , produced by
the requestorr thaE duplicates the hydraulic
compuEer model used to determine the limits of
the 1O0-year floodway showa fo. _on the effective Flood
@ap (FBFU)/FrRfi. (see
Paragraph 65.6(a)(8) of the NFIP regulations.)
The calibration rnodel may be either the FIS
floodway model, reproduced on the requestorr 5
equipment, or a model EhaE yields t,he comPuEed
floodway widths and water-surface eLevarions
presented in the Floodray DaEa Table for
in che effective
FIS reoort.
9. prirrroor, ( including full input and outpuE
Iistings) from a revised hydraulic model for the
-year waEer-surfece
elevations on . The revised model nust be
created from the calibraEion model (Item 7) and
nust meet the requirement(s) lisced betow.
The rnodel must be based on the same peak
discharge vslues used in che calibracion
model (Item 7).
The model must be based on che peak
discharge valueg deterrnined in the nert
hydrologic an:lysis (Itern 5).
The model must account for the effects of
Ehe changed hydraulic conditions on nhich
the revision requesE is based.
In addition, lhe revised model must account for
the effects of any encroachments that have
occurred in the 100-year floodplain since the FIS
hydraulic nodel uas developed and nust cover I
sufficient Length of so thlt
t.he eater-lturfece elevations cotlPured at croS!r
sections up8treen end do$nstrean of the reviged
reach erill match Ehose shonn at the same cro88
sectioos on the Flood Profiles in the effective
FIS report within approrinately 0.5 foot. All
changes Eo the input dete in the calibration
nodel (Itern 7) nusc be highlighted on the
printoucc. (See Paragraph 65.6(a)(E) of the tlFrP
regulations. )
Required Received
Descriotion of Data Reouired Received
10. A hydraulic
descripEion of
yeat flood on
analysis, including a brief
the nethodology used, for the 100-
. ( see
Paragraph 65.6(aXIIof the NFIP reguLlt-i.ons. )
11.Printout s
listings )
10O-year
( including ful1 input
from a revised hydraulic
end out put
model for the
floodray on
calibration model (It,em 8)
requirements Listed below.
created
and must neeE
The
the
t.he
The modet must be based on the 100-year
peak discharge value(s) used in Ehe
calibration nodel (Item 8).
The nodel nust be baoed on the 100-year
geak diecharge value(s) determined in the
new hydrologic analysis (Item 5).
The model must accounE for the effects of
the changed hydraulic conditions on which
the revision requesE is based.
In additionr the revised model rnust eccoun! for
t,he effects of any encroachnents that have
occurred in the 100-year floodplain since the FIS
floodway model nas developed and nust cover a
sufficient length of
-
30 chat
the lreter-Eurface ete@ widths
conputed at cross Eect'ions uPstrean and
dornstream of the revised reach will match those
shosn et the 3attre cross sections on the Floodltay
Data Table in the effective FIS rePoEt. The
revised model nust be based on the equal
conveyance reduction nethod unlegg agreenents
have been nade nith effected Property onners that
an alternative rnethod would be uged. The neE
effect of the changed hydraulic conditione, the
encroachments that have occurred since the FIS
floodray raodel rtas developed, and the revised
ftoodray linits rlust not increage the conputed
1O0-year nater-surfece etevationr by nore then
1.0 foot above thoge cornpuEed in the calibration
nodel (Iten 7) or thoae conPut'ed in the revised
nodel (Iten 9), shichever rre loser. (see
Paragraph 65.7(b)(4) of the IIFIP regulations.)
Description of Data
L2. Docunent,ation, a9 shosn below, concerning the
approval of the revised floodray. (See Paragraphs
65.7(b)(l)' (2), and (3) of Ehe ttFIP regulations.)
Copy of che public notice distributed by
the conrmunity sEating Ehe communit,yt s
intent to revise the ftoodway or e
stacenent by the corununi Ey that it has
notified all affected property ownerg and
affected adjacent jurisdictions.
Copy of e letter notifying the appropriate
State agency of the floodway revision.
Documentation of the approval of the
revised fLoodway by che apProPriaEe SEaEe
agency.
locations and aLignmencs of aL1
used in the revised hydraulic
and ll)1 strean alignrnents, road
the connuniEy boundaries. The
and
Reouired Received
x
13.
14.
Corporece Limit map and/or annexation ordinances
rhaE reflecE Ehe current conmunity boundaries.
A topographic map t,hat shows the revi sed
and
boundaries, the
crogs gect ions
models (Icems 9
al ignnenEs, and
rev i aed
boundaries nust tie into
ffi effective FrRr.r/FrRt{ and FBFt't
upstreem and donnstream of the reviged reach. The
scele end topographic definirion of the mep musE
be sufficient to provide reasonable accuracy, and
the nap nuet be certified by a registered
profes t ional engineer.( See Paragraphs
65.5(a)(fr) and 65.7(b)(5) of the NFIP
regulations. )
15. ttAs-builtt' plans, certified by a registered
profesrional engineer, for aLl project elemenEst
apecifically the l{est Mill Creek relocation
projecr. \oM /t'II
a7
J
\i
\ ,Yr \s/v
u
.\.\rll'/u
,bH uo
olw''. /od
L w
Description of Daba Reouired Received
16. The following data concerning
Ehe
the ability of
al ong
EO
rneet the mininrum des ign and oaintenance
requirernents established for levee systems in
section 65.10 of the NFIP regulations:
Preeboerd - Evidence which shoss Ehat the
levee(s) meet(s) the minimun freeboard
requirements set forth in Paragraph
65.10(b)(1) of the NFIP regulaEiong.
Clorurer Evidence which shows that all
drainage sEruct,ures chat peneErate the
levee(s) are fitted ctith closure devices thaE
are (f) structural parts of the levee(s)
during operaEion and (2) designed according
Eo sound engineering practice, as set forch
in Paragraph 65.10(b)(2) of the NFIP
regulations.
Enbenkoent Protection An eng ineerini
anafysis which demonstrates E.hat. no
appreciable erosion of the levee
enbankment,(s) can be expected during the 100-
year flood. The analysis must be perforned
according to the guidelines set forth in
a.
b.
d.
€r
Paragraph 65.10(b)(3)
reguLat ions .
of the NFIP
Stebitity An engineering analysis that
evaluates the stabiLity of the levee
enbankrnent( s ) and foundation(s). The
analysis nust, be performed according Eo the
guidel ines set forth in Paragraph
65.10(b)(4) of the }{FIP regutations.
Settlcot - An engineering analysis that
aseesle3 the potential for and magnifude of
logaer of freeboard that roa', result from
settleoent of the levee( s ) and Ehat
deroonstrates thet the minimum required
freeboard will be maintained. The analysis
must be perforned according to the guideliner
set forth in Paragraph 65.f0(b)(5) of the
}{PIP regulations.
Descriotion of Data Reouired Received
f. Interior llraioage - An engineering analysis
of Ehe pot,ential hazards associated nith
floodwaters that originate on Ehe landnard
side of the levee(s) and that are prevented
by the levee(s) fronr floring
into
the guidelines set forth in Paragraph
65.I0(b)(6) of Ehe NFIP regulaEions.
Operationr -- A formal levee operacion Plan
that meetsr at a minimum, Ehe requirements
set forth in Paragraph 65.10(c) of the NFIP
regulat,ions.
lleintenance A formal levee maintenance
plan chaE meets r at a minimumr the
iequirements set forch in Paragraph 65.1'0(d)
of the NFIP regulat,ions.
i. Alternative Pederal Agency Certificatioo -As en alternative to the daca described in
Items 16a - 16e, I certification by a Federal
agency rith responsibilicy for levee design
thaE the levee(s) has/have been adequately
designed and constructed to provide
prot,ection from the 100-year flood. (See
iaragraph 55.10(e) of the NFIP regulations.)
Such a certification nust r howeverr be
accompanied by an adequate interior drainage
analysis. (See Item f above and Paragraph
65.lb(b)(6) of the NFrP regulations.)
17. Hydrologic and channel infornation for l{est l{il1
Creek.
c.
h.
18.
19.
20.
2L.
Hydraulic charts PrePared of Transgortationr Federal
Hydraulic Computations.
by the U.S. Departnent
Hi ghway Adninistration.
x
x
x
x
x
Copy of "Handbook of Hydraulicsrrr by Ernest F.
Breter and Horace lfillians King.
Copy of ttstotn Drainage Design and Technical
Criteriar'r by Jefferson Countyr Colorado.
22. Copy of the Los Angeles County Flood Control
District Design ManualI dated Marchr 1982.
I
I
Descriotion of Data Required Received
23. Copy of rrDerign of Small Demsr" by U.S.
Departnent of the Interior, Bureau of
Beclanat i on.
24. Copy of trPublications in Hydraulicsr f990
tlaiional Conference on Hydraulic Engineerrrtt by
U.S. Departnent of the Interior, Bureeu of
Reclarnat ion.
25. Profile entitled, "Gunn Property Eydraulic
Analysis of Channel .tl
v
-L-
x
.)a--' Wdlht Weter Enginccrr, lnc.
DENVER OFTICE GLENWOOD SPRINGS OffICE
ifs wcat !6th Avr., trhc l(n A tl! C'olofrdo Annu:
o;nei, colo.ao loztt P' o' lor 219
plt fi-rru Ghnuood sgtinp' Colotdo t1602
{x3) g1$Zttt
Dcnvrt Ditcct Um: t93'16m
July 6, 1990
Mr. John L Matticks
Chief, Risk Studies Division
Federal Insurance Administration :
500 C. Sreet, SW
Washingto4 DC 2M72
RE: West Mill Creek, Town of Vail, Colorado
Case No.: 89-08-09R
Dear Mr. Matticks:
This letter is in response to the letter on the above subject dated April 18, 1990, to the
Honorable Ken Rose.
You provided a 90 day deadline within which to provide further submittals regarding your
request. This letter, with appropriate submittals, is well within that deadline.
Your detailed letter of April 18, 1990, was belpful in fully understanding your concerns.
Attached you will find analyses as follows:
o A definition of hydraulic conditions throughout the proposed channel
relocation.
o A determination of desigl adequacy at critical poins.
o A demonstration of nonerosive release of flow into the existing downstream
channel.
The owner of subject lot 10 in Vail, C-olorado, constructed the relocated channel of West
Mill Creek across lot lQ commencing in the fall of 1989 with final completion in June,
1990, subsequent to the 1990 spring snow mclt runoff.
Visits to the relocated channel were made by Wright Water Engineers (WWE) on May 23,
199Q May 25, t990 and June 10, 1990 to determine tbe status of constructiorl to inspect
the adequacy of constructioq and to make detailed field measurements.
it I I
Mr. John Matticls
July 6, 1990
Prge 2
MeaSUrCmentS wCrC made to:
o dctermine charaaeristics of the flow on each of thc sloped drops;
_ o measure the surface velocity of the flow;
o survey watcr surface Profile; and,
o make field surveys to check elevations and mcasurements of the channel
bcd, top of banla, crest elevatior\ and other clevatiors such as at the
dowrstr-eam exit of the new channel at thc north lot line of lot 10.
In additioq we inspected the Mill Creek channel upstream of lot 10 and the culvert under
Mill Creek Drive. We determined that the upstrcam channel is unstable and subject to
debris flow witb rocks, and that tbe entrance to thc 6$inch culvert upstream of the WWE
project area is subjea to plugging.
It was also determined that, at the location where the channel exis lot 10 to the north, the
stream bottom is controlled by a large horizontal rock, at least 8 feet long which provides
a control at the propcrty line. Also, approximately 8 feet downstrealr\ two v-ery la-rge
boulders, one on iacfi Uanh provide width control. The bottom of the existingchannel in
the vicinity of the north lot line is well armored with large rocks.. Th9 slope. of the channel
north of the north line of lot 10 steepens to approximately 12Vo u it continues north.
Following the three visits and after reviewing the survey dat4 I personally analyzed the
elevations and measurements and:
o defined hydraulics condition throughout the channel;
o determined channel adequacy at critical points; and,
o analyzed the flow for erosive velocity of the watcr exiting to the downstream
channel.
The above analyses were computed for the channel as designed and were then compared
with the variati6ns in the field measurements. Based uponbur surveys, computations.and
water surface profile analyses, coupled with review of original data and design submittecl
to you on June 1, 1989, we determined that:
1. The field-observed flow conditions of the relocated channel are good.
2. The l0Gyear design flow velocity at Crests 1,2, and 3 is 8.7 fts.
3. Maximum design velocity in each sloped drop for Drops 1, 2, and 3 is 9.3 Ss'
I
I
4.
Mr. John Matticla
July 6, 1990
Page 3
Superclevation of water at critical poins of highest dcsign vclocity for Cbutes 1, 2,
and 3 is 0.9 feet.
Tbe l0Gyear design channel oonditions at the Donh exit of the channel at lot l0 -- have the following characteristics:
o the vclocity is 8.8 &s.;
o the depth is 1.2 feet; and,
o the superelevation is 1.1 feet.
from the upstream culvert, three baffle rocls bave been installed immediately
downstream of the arlvert exit for ener5f dissipation.
The plotting of the relocated channel as measured in the field and as shown on the
original design drawing and the plotting of field measurements thal measured water
surface profile resulted in an opportunity to compute actual roughness and enerry
dissipation of the as-built charurel lining.
The reason for the field analyses of the channel roughness is that, prior to
construction of the slope drops, Manning's "n" factor could only be estimated.
7. The Contractor constructed the channel liiling and sloped portion of tbe drops with
a high degree of roughness to achieve white water conditions, resulting in a
Manning's roughness coefficient of approximately 0.09.
8. During field observations in May and June, 1990, it was determined that the
construction varied from the design, and as a result, the C.ontractor made
modifications that resulted in the following:
o crests 1, 2, and 3 have crest lcngths oI12" 12, and 12.5 feet respectively;
o slopes of the chutes for sloped drops 1, 2, and 3 arc 27Vo,l7Vo, and 75Vo
respectively; and,
o for decorative purposes and additional frccboard, a row of 4-foot derrick
stones have beCn added on the right bank from S-feet downstream of Crest
3 upstream to the culvcrt exit.
The USACE had requested that consideration be given to aesthetic channel
design. The three crests and chutes, the thrcc cnersf dissipation stones, and
6. Assuming that the l0Gyear flow would be discharged from the 6&inch upstream
culvert, tbe exit velocity would be 13.9 $s. Due to the 13.9 Ss discharged velocity ;
I
t
Mr. John Mattick
July 6, 1990
Page 4
the channel lining stones supplcment the appropriate landscaping to give the
channel a natural aPPearance.
9. A determination of Froude numbers for the l0Gyear flon, at various critical locations
" of the relocated channcl are summarized below:
o N, at Crests 1,2 and 3 is 1.0; and ,
o N, at the bottom of Chutes 1, 2, and 3 is approximately about 1'3'
The attached computations will show that:
a. Hydraulics condition throughout the proposed relocation are satisfactgry: Tl.e
pdtentiat for stone disphcEment at ihe culvert outlet has been handled with
installation of three large cnergl dissipation stones.
b. Tbe potential superelevation on the outside of the cu#was analyzed. and the
conditions were'found to be satisfactory with the design and as built.
c. Channel scouring potential in the existing channel north of the north line of
lot 10 is satisfactory:
o the velocitY of 9 fos.;
o the existing channel bed and the right and left bank boulder controls;
and,
o the large amount of channel energ/ dissipation on the chute of sloped
droP 3.
using the u.s. Bureau of Reclamation riprap *i$. Tt:til couplg{.. with field
.""r-ur"*"nts and computed flow velocity, w-e cbncluded that riprap stability- is not a
oroblem. In addition, ihe channel as boih designed and constructed is satisfaclory 3:
itiJiLG ;t th; attached comPutatioru, watei surface profile drawing, and field
observations.
The attached computations and measurements were provided to.show the water surface
;;;fi[:- Th"y Aeinonstiati that there is nonerosive release of runoff to the existing
downstream channel.
Ronald L Rossmiller, P.E., william P. Ruzzo, P.E., and K9nn9t\ 3. Wriglt' P.!:3ll
;ft.tp"r"d i; iil iltd obsirvations and general doormentation in May and June, 1990.
'.
j t'
Mr. John Matticks
July 6, 1990
Page 5
On May 25, 1990, we were accompanied by Mr. Clifford.{. Pugh of thc U.S. Bureau of
Rcclamation Mr. Pugh joined WWE on the May ?5, 1990 field obscrvation as a
professional collcagrrc and co-invcstigator, not as a rcprcscntative of USBR. Mr. Pugh is
an cxpericnced rock chute specialist who has provided hydraulic modelling for another
WWE project. A copy of the Junc publication of the U.S. Dcpartment of Interior, attached,
helps prwide furthcr information on thc background of Mr. Pugh's profesional relationship
to WWE via a contact with thc State of Colorado and USBR.
In conclusion, we would like to point out that we submitted to FEMA on June 1, 1990 a
CI3MR based on WWE design of tbe West Mill Creek relocated channel. The CI-OMR
application was made pending a construction approval. The CI-OMR application is now
moot. WWE presumes that Vail will resubmit a reguest form for approval of a LOMR at
their convenience.
WWE is submitting this letter and four attachments to you as described in your letter of
April 18, 1990 to the Mayor of Vail.
If you have any guestions regarding this matter, please telephone me at anytime at (303)
48G1700, Denver, Colorado. Thanks for your consideration and patience in this matter.
Very truly youn,
WRIGIIT WATER ENGINEERS
KRW/RLR/smg
cc: Michael Baker, Jr.
(Ltrl6.RLR)
891-022.000
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2490 West 26th Ar,e.-s] 100-A
Denver, Colorado 80211 -
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WRICHT WATER ENCINEERS, lNC. Date
2490 West 26th Ave.fite 100-A ftoi.
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Denver, C-olorado 80211
Te[ G03) 480'1700
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Denver, Colorado 80211
Sheet 3 ol trt
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Tel. 003)480-1700
Subject
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WRICHT WATER ENCINEERS, INC.
2490 West 26th Are.-sf 100-A
Denver, Colorado 80211 -
ref. 003)489"!7Qo
Subject
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Sheet 7 ol /O
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I V rFfF Wf( Umc zuruEr-Rrue.u.
I 16 lorrrH A'ro trnEET r llrm s . DEtrrvER. oo.otam Ea2 . &n 76rrf,ri
//fu"*
Ur. lea Urboasa, Cbl.ef
ll83tca Plannlag Prograu
Urben Drclnage ead Flood Coatrol DLatrlct
2480 l{egt 26th Avcnue, Sulte 155-8
Deaver, Golorado 80211
May 1987
tlRC ll.le: L550143
Dear Ben:
Eocloaed berewlth ls thc Jeffergon Couuty ttstotr Dralnage Deslgn and
Technleal Crlterlarr prepared by WRC Engtnecrl.ug, Iuc. (llRC) tn accordance sLth
our Contract No. 85-02.07, dateil Aprll 1, 1985.
The tecbalcal lnfor:oatlon preaented bereiu sae developed uslng current state-of-the-art technology for the regloa. The docunent addresses dralnage pollcy, floodplaln regulatton, eaforceoent, end othcr adulnl.etrgtlve aspects 1n addltlon to tbe hydrologlc aod hydraulle crlterla. Due to the dynaolc nature of the paraneters lnfluenclng urban dralnage condltlooe and dralnage ctlterLa, the
Laforoatlon nay be eoended in the future.
Partlcular ettentlon ras pald to provldlng crlterla that reduces ran-power
requlteoents to develop and revlew dralaage deelga aubulttals. Thie was accou-plished by preseotlog ooly the criterte to be utlllzed aud ellnluating the
procedures aDd data required to devclop crl.terla.
IJe appreclate the opportuul.ty to be of eet'vlce.
Beapectfully SubDltted,
WRC ENGINEERING, I
tlllllen P. Buzzo,
Vlce Preeldeat
Eoclosure
co{strnNc ENoI€ERS
2.
Thc raxlnru vclocity for thc laJor otoru flood pceL
5.0 fcet pcr rccoad tor r Type-I dltch rnd 7.0 fcet typc-Il dltcb. Tbc raxtnrl veloclty for the ulnor rhall not crcecd volum thovn ln Trblc-701.
rhell not crceed per reeond for a rtorn flood pcak
3.
{.
5.
6.
llrc nlnllrro a.dlus of culvltuEe rbell be 25 fcct.
BouS,hneas Coef f lclcnt
ffi preecnted 1a Dlg;urc-702 ahal1 be used ln the
capacltt co,Eputatlo! for rordtidc dltches.
Graea Llato8
Ibc graec lbtng rhell bc La eccordaace rith the llANUAl. Sect{on-2.3.2,rl{aJor Dralnagc - Graea Llaed Channcle - Grles.tt
Crora Culvert Locrt Lorl
@ a rosdglde dttch eharl aot be cartled 1n excess of 500 fcct bcfore bclng dlach8rged into e natural draloageuay. Grade
ebengea of grerter thaD 2t ahall requlrc ! croaa culvert. The flnal locetlon of culvcrte ehe1l be deternLned by erlatlag fleld condltions
cacoultered durlng luetellatlou. Culvcrta rball be lostalled at the
slopc of the latursl terral.n.
Drlveway Culverte
Drlveuay culverts ehall be alzed to pass the oloor gtorn dltch flow
7.
8.
capscity slthout overtopplDg th€ drlvarsy.
ahall be . IEI x llil csPA (I5r' equlvalent
secttons. Larger sizce uay be requlred by
The uinluun rize culvert
round pipe) sith flsred end
the Boad and Bttdge Dcpart-
7.7 UrOl
DCat.
l{al ot Drelna8e Capaclty
The capaclty of roadslde dltchea for uaJor draluagc florr ls rcatrl.cted
by the uaxLsun flow depth allored at the atreet erosn (Po1lcy
Sectton-3.4.4). Hotrever, Che flou spread should Dot exteDd outslde the
street ROI| .
GR.ADIEI{T FOONTILLS C!|ANNELS
For high gradlent dralnagewaye located ln the foothllle, an alternate
proccdure for chaane 1 deelgo uay be cousldered, provlded the uatural eolls bave
rufflel,cot quantlty of large rnorlng cobble or roch Eaterlals.
There are three typee of htgh gredlcnt cbannel condltl.one for shlch thla
groccdurc 1111 be penleaible la thc foothllla: l) channele rdequately trlored by aettvc letcrlals; 2, rrtlflcelly ernored cbenoels uelog rlprap rben the
drrlaagcuay has eul.trble artl.vc eolla; 3) c cooblnatlon of the ftret tro. The llnltetlons rod deatgn proccdurca rre preaGlteil hereln. Tbe btgh gradlent
cbrnnel derlgn proccdure stll be coagldered for both uaJor rud roall dralaage-
erlrs, protrtded all thc LD-r1tu condltlons 8rc Eet.
JCSDDIC UAY 1987
7-18
The follorlng, variebles deflned belou are ueed for the hlgh gradlent channel
procedure:
b - channel bcd wldth ln feet
d.r, - sicvc dl.eetct or lnteroedlate a:r16 of the cobblee or boulder: for
rhtch 50 percent le fluer by relght
dsq - eleve dioeter or intetrcdlate anle of the cobbles or boulders for
shtch 84 pereenE ls flaer by $elght
F - Froude Nuober
f - Darcyre frlctlon fsctor
g - leceleratloD due to trevlty (32.2 fps2)
n - tlannlngt e roughneae coefficlent ln secouds per foot ralsed to the
one-thlrd Poeet
Q - deel8l flou 1o cublc feet per second
S - longLtudloal slope of the cbannel ln feet per foot
S" ' apeclflc glavlty of the slone Deterlal
y - depth of flos la the centet of the cross sectlon !n feet
y____ - na:rl.ouur allosable sater depth at deelgn flow a! the centetllne of 'DsK the chaunel
'r - unlt reigtrt of rater In pouuds per cublc foot
T- - uolt welght of rock and rlprap ln pounds per cublc foot -E
t - bed shear etress ln pounds per eguare foot
t - crltlcal centerllae chear atre66 Lu pounds per eguare foot c
7.7.1 Llnltatloae on Uae
The chanoel deslgn procedure deecrlbed ln Sectlon 7.7 of these CRITERIA
ehall g[ be peroltted ln the foothllle above 6000 feet 1o elevation and only
vhen the proponent deaoostrates to the Deelgn end Revlep Eugloeer that the natlv€
soll 1o the propoeed channel botton and banka has been tested ln accordance slth
Sectlon 7.7.5.1 and the trflnett fracttoa Deet6 the follortog gradation tequl.re-
taDt8:
AT LEAST 20 PERCEN OP TBE III'DIEII IRACf,IO{ ET flBIG T IS TETAIf,ED (nI A
SIAXDAID 3/4-rNCE SIEVE.
7.7.2 Ulnlnun Deslgn CaPacltY
Wtenever thls deslgn procedure le used, the open channele aha1l be deslgned
Go.carry the 100-year geak florr resultlng fron a fully devel,oped (future land
uae) upetrean baaln and shal1 loclude Cbe rcqulred approprlate freeboard..
JCSDDTC IIAY 1987
7-19
7.7.3
The hor{zontal alignrent of a hlgh gradlcnt ehannel eha],l be dealgned to ae etrolght es posslble. Stral8ht aecttoDs betreen culnea shall be euch that length of the etroight aectlon la cqual to or Baeater than th. length of upstre.n cune or 100-feet, shlchever le longer.
tlre centerllnc radlue of eacb cune shall be ao lees then clght t1ne6 the bottol uldth of the chenDel, or t00 teet, vhlchcver is treater. The naxlmrrm dsflcctloa engle at a cutnre eha1l oot cxceed 45 degrees.
7 .7.4 AII of the dcglS,n alds tbat follos ln thls Sectton 7.7 of. the CRITEkIA are baeed on tragezoldal channel bavl.ng tiprap or naturgl cobble botton snd slde elopee and aaeuoes that thc eide alopes ere 3-horlzontsl to l-vertlcal (i.e.,3:l) or flatter. Flstter alde alopes than 3:l are recon-ended, but they shall Dot be steeper than 3ll.
Channel bottou vldth shall be at least tno ttneg the flov depth at the dealgn (1.e., 100-year) dlscharge.
7.7.3 Channel Bed and Bant Dlaterlale
The channei uay be llned rlth latlve cobble, provlded the d,^ of the t'coarset' fractlon Ls of adequate elze gs detenlned uilng tbe deslgn)$rocedure
contal.ned lu the tenalnder of Sectloo 7.7 of thcae CBITERLA. If the ttcoarset'
fractlon of the natlve raterlals 1s of Luadcquate aize, gradatloo, or durabl11ty,thc chaanel bottou and eldes uay be llned vlth luported rlprap thst Deet the el.zc, gradatlon, and durabllLty requiremeats contalned ln Voluoe 2 ot' the Urban storn Dralnage crlterla lianual. Hore speclflcally, the Daterial eanpling,alzlng' gradatlon, and durahllity ahall Deet the follorlng nluioun requlremenrs:
7.7.5.1 Saupllng of ln-sltu Daterl.alo
a. Sauples shall be taken at 200-foot latervals or, Jf the channel length le lees than 400 feet, eanples eha1l .be tahen lrr at least three equally
spaced tocatlons. Samplea ehall be taken et each bank and the cenrer-llne of the proposed 6teep gradlent channel. One aauple at the centerllne ehall be at the propoeed uld-depth of the channeL. The
eecond sanple at the centerllne shall be taken one foot belos the
proposed proflle of tbe channel.
Ttre eaoplee shall be large enough to Dermlt ecparatlon lato t'f inet,fractloa (1.e., paeelng 2-lnch eleve) and lnto ttcoatsett fracrlon and to pcrrlt sieve gradatlon eaalysls of the ttflnett fractlon.
The lflneil fractlon eball then be sleve graded to deterurJ.ne tf 90 per-
cent of all saaplce Deet thc oinimum rcqulreDente of Sectlon 7.7.1 of
these CRIIERIA (t.e.,8t lca6r 20 percent by eelght of the',fine,'fractlon !e retalrred on a 3/4-1nch aleve).
be
the
the
b.
c.
Channel Bed and Bant Dlaterlala
JCSDDTC HAr 1987
7-20
the ttcolree" fractlon ehall then be enalyzed uslng the llobuan Ucthod
(8,ef. 33) ro deBcrlbed la feble 702 to deternlae lf the Dstlve 1l-6itu
Irterlal ts of ulniDuo rlze and gredrtton requlred by the reoalnder of
Sectlon 7.7 of theoc CRITERIA. If th. !'co8r8ert fractlon ig found to be
landcquate, luported rlprap of edequrtc riae aad gradatlon ray be used
aa a llncr.
7.7.5.2 8anp11ag of Luportcd rl.ptap
llprep Co be ueed for ateep gradlent chaanel llnlag ehall be aaopled at thc
qurrrt end elgo upon dellvery to the conatructlon sitc uciag the tJolnan llethod
dcrerlbcd ln Tablc 702.
7.7.5.3 lcqulreucnts of the "coarset' fractlort
As.trted lbove, tbe "coargerr fraetion (l.c.r the cbannel llner) uay bc
elthcr n tlvc la-rltu rocb or cobble, or ray be lnportcd riprap. Ia clther caee,
the folloring rcqulrrnents shall be oet.
d.
t.
b.
c.
The durabllity, reatherlng, placeueot, and other requlreDeDte sha1l
Deet or cxceed thc requl.reoente descrlbed ln the Rlprap Sectl.on of
Volune 2 of the Urban Storn Drahage Crltcrla Hanuel.
Thenever tbe d.r, of the "eoarset' fractlon la larger thgo one foot, the
hydraullc calcdlatlone for critlcal ehear ltrcse and any other parane-ter uslag tbe equatlone contalued ln Sectlon 7.7 of theae CRITERIA
ehc1l be perforred uslng d.., - I foot. llhcnever the d.,., la leas than
ose foot, lhe actual measufe? dr. ahall be uaed Ln all Calculatlona.
;:;.t"ato of dr./dr' of the "coar8e" fractl.on uuat be between 1.5 and
Longltudlnal Slope Llnltatlona
The uaxlor.u peroieslble bed elope ahall be the olope rhlch ltults the
calculated bed shcar Btreas et the centerllne of the channel croas sectlon so
that Do algalflcent bed-oaterlal uoveoeat occur8; horever, tbe longltudLnal slope
rbell aot erceed 0.04 feet per foot. The follorrlng teo equatloDs lre used to
deternine the bed ehcar streee aod the crltlcal bed shear Etres6:
1-Yys (Equatlon 703)
and
:0.04 (r" - v)dro (Equatlon 704)
tn rhlch
7 .7.6
bed ebear stress ln
crltlcal centerll.ne
foot
gouods per sguare foot
bed ehear atress ln pounds per square
unlt rrelght of sater ln pounde
degth of flow ln the center of
cubic foot
cross eectlon ln feet
Per
JCSI}DTC UAY 1987
7-2r
the
rB-
d5o '
Ioltl.tualtD.l rlope of chrnocl tn fcet per foot
uolt uclght of the roct llaerals of
pouada pcr cublc foot
the intcrrcdhtc exis dbcoeloo of rople for rbtch 50 pcrccnt tc flner
thc cobblc or rlprap :ln
the cobble or rlprap
by relght ia fect
&E: lor channcl lirer to bc rclatlvcly etable, thc brd ahear ltra8r bee to bc lcra than thc crltlcal bcd thear Etress.
7.7,7 Depth of Flor Llnttatlma
fbc depth of flou ls degendcnt on the dcalgn flon, the longltudlual slope of the cbennel' end thc rire of thr roclr linlag of the chEntrel. Obvloualy, theie la ru optluuo cobluatlon of thcee deelgu parloetcra for a atable, atcep gradlent
cheanel. Borever, to Gnaure e strble deslgn, the narluua depth of flos ai (i.e.,
I-,.*) thc chenncl ccnterltae rhall be detcroloed uslng Equatton 705 or shall be
f'!BF€ fcct, uhlchever ls teae:
r**
Ln vhlch,
r**
s a
s
dso
(Equatlon 705)
uartrnuo allouable rater depth at dcelga flos (1.e., Q1O0) ,ar tbe
channel ceDterltDc ln feet
apeclftc gravlty of the stone Eloerelg (1.e., t"/y)
(ace Equatlon 703)
(ree Equatlon 704)
rn rddltlon, to rcduce olrtlDg of channelar'the ululnuo depth at deslgn flor (1.c.' Qruu) ehall be l-foot or tuo tLuee dror rbl.chever le greater.
7.7.8 Frlctlon Factor of Chgnaelizatl.on
me U re of the drag the flos exerte on the
bed end banlr aoll ead roclc pttt1c1e6. Although ilaonlngrs roughnees coefflclent
1a oftea ueed, therc te a cmputttloDel beocftt ln eoploylug the Darcyrs frlctlon fector ln the steeP tredlent chalDel coDputatlon6. The tuo frlctlou factora are rcleted by the cxprcaaton:
! - r.486(f/sg)r l2!LI6
tn rtich
n - llanofugre roughocer coefflctcnt
f r Darcyrl frlctlon fector
g - eccclcrctl.oa duc to grevlty (32.2 tgzzl
(Equatlon 706)
- 0.04(s5 - 1)d5O
JCSDDTC }IAY 1987
7-22
For rrtloe of y/d.r, frm I to 100, the Darcyre frlctlon faclor can be approxl-
rated usl.ng,
. -rI7 t (tl$)" - - tr;ll@ (Equatl0n ?06-a)
Bere, rtlrrtt ta the natural logarlthn. Thie equatl.on expreaaeB the fact that, as
flosc becoDc vcry rhallw' the dreg coefflclent Lncreaeea (Ref. 32r 36).
7.7.9 lroudc Nuuber Lloltgtloae
lhe Froude auuber ln a rteep gradlent channel ehall be lcgs than or equal to
O.8 rnd rhall bc celculated uelng Equatlon 707:
I tn
F - (8S/f)^" (Equatton 707)
ln rtleh
F - Froude Nuober
. S - (8ee Equatloo 703)
f - (aee Eguatton 706)
7.7.10 Bcd lltdth Crlterla
Optlulzlng flor' channel aloge' flov depth, and bed vldth ls the responsl-blllty of the dealgn englneer. Borever, ln order to lelntalo cbannel atabillty,
tbe olnlnro channel bed vldth shall be tvo tlmes the depth of flou or as obtalned
uelng the lngllclt relatlonshlp of Equatlon 708, sbichever glves the greater bed
vldth.
(b/
(b/y
ln yhich
(Equatlon 708)
- depth of flos at dealgn flow ln feet
- chaunel bed stdtb ln feet
- (lce P4uatlon 706)
' (aee Equatton 706)
S - (6ee Equatton 703)
7.7.11 lrceboard Requlreoenta
Frceboard for the 100-year pcek dlecharge shall be l-foot or O.S-foot plus
thc evcrege veloclty head, shlchevcr le grcrter. The average veloclty 1e deter-llled by dlvldlng the deelgn dlecbarge by thc croas lectlooal erea of the flov.
JCSDDTC l{AY 1987
tu/"1 * r)3/1- _(gtll, a
(b/y + 2tlr)rlz \8/ (esy5)1/2
I
b
s
f.
7-23
7.7.12 luuarv of Dcrlin Proccdure
Ihe derlgn procedurc Ie llluatreted ee a ftou cbart ln Flgrre 707. Aftcr
tbe flon haa been dgtcrulned !t thc llte locrtloa and che tasted t'flnctt fractlon of the rolle tadlcrtce thrt tblr grocedurc la aeccpteble, aclcct r tr181 bed
rlope.
llcrt, calculrtc the uaxluuu dloryeble dcpth and tcat Lt to bc rute that the -dclt!" t_o^_ "dsot' rrtlo lc equal to or grcatcr than lrr* calculeted uelng
Equetlon 705.
llext' calculete tbc frlctlon factor ueing F4uatlon 706-a aad thea check the
Froude uuuber to be turc lt 18 lc.! than 0.8 u8itrg Eguatton 707.
If cvcrythlng te att1l ultbln the allorable coD8tre1nt6, calculate the
channel bcd rtdth ualng Equatloq 708 and deterDlne the nlolour freeboard requlre-!.rtr. Glearly Equatlon 708 le copll.cated and ttlcLy to aolve; hosever, lt can
be rolved uith tbe ageletance of the graph tn Ftgure 708.
7.7.13 Deslgn E(spple
Slnce the destgn procedure ca.a be qulte cmplex | !D erauple vae prepared to lllustratc the couputatloaal atcps requlred to arrLve at a Eatl.sfactoly ansrrer.thle exaople ie for a channel tlrat hae adequate :ln-eitu annorlng. Ilorever, the
celculating procedure le also ldcntlcal for a cbannel that ueea rlprap llning.
The procedure ls aa follos:
DctermLnc dcalgn dlecharge :
Qloo - 250 cfa
t'Fl.ne" Fractlon of So11: The geotechnlcal englneere have deterolned that the "flne" fractlon of the ln-sltu aolls bave at least 20 percent
by uelght tetalned on a 3/4-lnch aleve. As e result, the deslgn
procedure of SectloD 7.7 uay be coneldered acceptable.
3. Allgnrrenta: Baalcally s stralght altgnnent slth tno gentle curves that
w111 neet the requlreDente of Seetl.on 7.7.3 ras selected.
4. Slope: The natural channel elope is approxloately 1.5 pcrcent, whlch ls lese than the 4 pcrccnt uarloun. Ttrerefore, try a alope of 1.5
PetceDt :
S - 0.015 feet per foot
t'Coaraett Fractlon of In-Situ Hatcriale: The eoll tc8tltrg progrrrn
perforred by a qualtfl..cd geotechnlcal eaglncer reveals the follorlng
results for the Itcoaraet' fractlon for tbe 1n-a1tu solla:
t.
2.
5.
dso
da+
s t
deq/dso
JCSDDTC ltAY 1987
0.75 foot
1.20 feet
2.65
1.60
7-24
Frou thfu drte yc .ee tblt tbls rEtcrlal lcctr tbe ftl,pslrlcd ulnluuu
rcgulrclcatr for rcoerrcn frrctlon of Chc channcl lller.
6. Chrnnel Dcpth: Urlng Equrtton 705 rc crlculate ller.
o.04(s- - t)dra
Iul'-'t.5
For our flrrt try, letrt ule y - t_-.trertcr tbru 1.0 fot y - 3.3 fcci. -!rr . 3.3 fcctr ttrce t/d5. t6
7. lrtctloa lrctor: Uelag lquetl.oa 706-a celculetc
I t^(f l8l't'' 1/(3 1ot2'sY/drOI)
, ::1:r'"''r3'3/0'75r)
8. Cbecl, tbc Froude Nuuber: Uelng Equetlon 707:
r - (8s/f)1/2
. (8x0.015/ o.LililLlz
F - 0.E8
Slncc 10.t, re aeed to reduce the Froude arnbcr to leee tban or equal to 0.8. llc can do tht; by elther lorerlng the lougltudloel elope or,lf yc rlah to ualutaln the alopc, re cln try to rlden the botton and
reduce thc flos depth. Tbc aecond agproach vlll rcsult lu en lncreased frlctlon factor and velocity for tble eraoplc and rlll be used hereln.
Uslog Equatloa 707 ulth F - 0.E, ve flnd
I - (8r.015) tO.8O2
f - 0.188
aad uafug thls value for f ln Equetton 706-a re tet
(8/0. 188)1/2 - Ll (3 ln[2.5yl0.751)
! '2.64 tt.
Ghect,
YIdSO- 2.6410.75 - 3.52
uhlch ta grceter than 1.0 end la acccpteble.
JCSDDTC uAt 1987
7-25
9.Dcd Wtdtbr Ualng lgurtlou 708 eG cla calculete the bcd rl.dth of the
cbrBnel !t tha dcetg;u flw rnd flope for tbc nrtlve ln-ttru channel ttalng rock. Solutlon of Eguetlon 70E tr rede rtuplc urlag Figurc 708.llnt celculrte tbc plaru.tx
- 4.87
10.
ll. Suurary:
Bed Slopc
dso
Flw Depth
lcd tlldth
lrcebogrd
llor Velocity
Sldc Slopc
JCSDDTC }IAI I9E7
- 0.015
- 0.75 ft.
- 2.64 ft.
- E.0 ft.
- 1.0 ft.
' 5.49 ft./a
- 3.5:l
lt\'t' o
\ r/ (gsys) 1/2
o.lE8 r/2
8
Fron Flgtrc 708 ye flnd
bly - 3.06
or
! r 8.08 ft.
Letb -8.0ft.
Freeboard: First ftnd the veloclty uelag
V .Q/A
Aaauolng a elde elope of 3.5:1,
I r 2.54 (3,512.64+8.0) - 45.5 fx.Z
P r 250145.5 - 5.49 ft./s
Freeboard . 0.5 + (s.cg)z lze
'0.97 ft.
Note: Since the calculate Frecboard 1o lcsr tbrn the l-foot uinluun,
uge e Freeboard of l-foot.
c, t ,?(32. 2r0. 015t2. 64'\' t'
7-25
12. Othcr Dlrchrrte.! It lt arfc to drrv r conclullon thrt thc channel
r1if oot crod; ltr llncr vhel thc flora ltc 1c.3 tban the deelgn flor.
Tlrc dcpth 1111 Ccnd to drop rt I nrllcr flor, rhtcb vt11 reeult in
itghcr'rcletivc rou8,hocss ead rlgplfleently rciluccd vc1oclt1es. On the
otier hrod, flore lergcr thsn tbc dcrtgn flor lay eeuac dnage 3o the
chennel llaer. Io 4ilnate bow r lrrgcr flgr rould effcct the channel
rcqulrcr e trlal and Grsor rolution urlngl
rod
$ft)rlz - l/(3 1o[2.5yldrol)(Equatton 706-a)
saa calculeted in SteP 6 of thle
rone Dovcoent of the chsnael llner
bappcue nhen Q - 500 cfs. lo ltert,
1/(3 lnl2.513.6/0. 75] )
0.134
(Equatlon 708)
laauDcy-3.5ft.
- 3.9
uc fiad bly - 2.1
to the rttlo of bh urlng the eruoed depth of
f lnit
Notc that y>Y--- - 3.3 feetr rtich
cranplc. As a*tteult, re clD crPect
rtcoaroert fractlon letcrlala.
Uelng Equettoo 703r re flod
t - tyS - (62.4r(3.6)(6.015)
- 3.4 Lbc.ltx.2
end uaing Bqugtloo 704' vc flnd
t - .04(165-62.4)(.75)c
- 3.1 lbs. ft.2
JCSDDTC TTAY T987
15 1 y+t)3 I 2 t $ t t+2t]rorl I z - 6 n\L I 2e/ (ety5 )
I /2
Dctenlnc rtet
ttcn
$la)Ll2 -
end
0. r34
Ualng Flgure 708r
Goparlng thle y' 3.6 fcctr ue
813.6' 2.2
tle eee fro corpering the caleulated tatlo of b/y to thc one obtahed
urlog the aaauoed I' 3.6 feetr the actual depth 1c cloee to the
"r"d"d dcpth of 3.6 feet. thereforc, letre uee l' 3'6 feet'
Ot.z*o.otitr.65rL12
o
7-27
Frrrrr thlr ec .Ge thet tbe bed rhcer 3treos tt 500 cfe crcccds the
crttlcel lheer acrcri errd thrt droage to the channcl llncr slll occur.
Ttrc dcgrce of thc deruge at teo tbes Qrrrn vtll dogeadl to e large
artcut, on Chc duratlon of thc ttrlc tbE-crltlcal ab3!r streea ls
crcecdcd. fo grovldc rorlc rafcty flctorr thc dc3ltner rhould coneidcr
rcduclng tbe cbrnacl rlopc chrough tbc urc of drop rtructuree.
13. Flnrl llole: lf thc Ln-eltu ratcrl.rls rcrc fousd to bc too anall for
thc dcslgn rlope ln thc ebovc c:trqlc, tbe dealgaer could hrve elther
fletteaed thc rlope or trlcd uelug m lryortcd rlprap lLaer.
7.7 .14 Sunary of Deslgn Conetralutr and lcqulrrptnta
lbe follolug ls ! tabular tunlry of deelgn requlrcDcDte and conetralnts
that aeed to be conrlilered rnd recognlrcd rten ualag tbe blgh graillcnt channel
deel.gn proccdure:
Solle:20 pcrccot or Uotc of ttFinett Practlon liae to
Be Retetncal oa e 3/4-lnch Sleve. Note: If thle la Eot Detr do oot uae tble proeedure.
All ro11 asDpllotl end teatltrS hae to be perforned by experleoced geotechnLcal
englneers .
l0(Fyear nlnLuuo.Deaign Flood:
All.gooent:
Itsdiue of Cunrature:
llar.. Deflcctlon Angle:
Cbannel Slde Slopea:
BottoE ltldth/Depth of Flo:
Gradation of Coarae
Practlon or Blprap:
rldth, or 100 feet, shlch-Bltht tfucl bottoo
ever la greeter.
450
3:I or flatter
tly>2
I . 5<d84/d5O<2.0
If dG^>l.0 foot' use 1.0 foot ln hydraullc
celcrffatlone
If d50<1.0 foot, u8e ueasured dro
Equatlon 703 and 704
Equetioo 705 or 5 fcctr whlcbcvcr le lese
Longltudlaal Slope:
Dcpth of Flw:
lla:rLono Dcpth:
l{lnloun Depth:
lrlctloa Prctor!
Froude Nrnbcr:
l-foot or 2dr0, rtlchcvcr le grcater
Equrttoa 706-a
Fj0.8 (Equatton 707)
JCSDIITC t{At 1987
7-28
TABLE 7O2 STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA
WOLTIAI{ TETHOD FOR SA]IIPLING CHANNEL SOILS
ll0TE: Thls procedure ls for sollr rhlch contrln Frtlclca grcrter than 2
Inches ln slze rnd rrs obtrlned fron'A llethod of Sanrpllng Corrse
Rlver-Bed lhterlalr by ll. Gordon lolmn, Trrnsactions, Amerlcan
Geophyslcrl Unlon, Uolme 35, llo. 6, Dec., 1954. ln addltlon, lf the
naterlrl contalns r rlde rrnge of ilzes, lnclude 300 to 400 partlcles
In the sanple.
Descrlptlon of Sampllng llethod - The determlnatlon of graln slze ls based upon covered by glven slzei rather than upon
their relatlve welghts. lt ls essentlally an adaptatlon of suggestlons made by
J.C. Grlfflths, Pennsylvanla State Unlverslty, for obtalnlng representatlye
sarnples of of heterogeneous naterlals. The nethod conslsts of the follorlng
steps:
t. In the reach of the strean, a grld system ls establlshed elther by paclng
or rlth actual llnes. The slze of the grid ls detennined by the length of reach which the sampler deslres to descrlbe. lf comparlsons rre to be
made between reaches, the sampler msh be conslstent ln hls choice of
length of reach to be lncluded in the sample.
2. After establlshlng the grid, whlch can be done by a pacing traverse as the
sampler picks up each pebble, 100 lndlvldual pebb'les are plcked up frm
the bed. (Ihe sampllng ls probably less subJectlve when llnes or tapes
rather than ptclng are used to flx the lndlvldual sampllng polnts.)
Randomness ln the selectlon of each pebble can only be obtalned lf the
sampler tries not to look at the bed as he plck up each pebble. The
suggested practlce ls to draw each pebble fron beneath the ttp of the toe
of hls boot.
3. The Intermedlate axls of each pebble ls neasured.
4. Unless the actual dlameters are of lntereSt, t rule or scale cln be
deslgned showlng class limlts only and each pebble tallled wlthln a_9rade
class lmmedlateiy. For thls purpose the Teritworth scale ls probably the
nost useful .
5. Ilth the pebbles placed ln the Proper classes, lt ls r simple natter.to plot a frequency dlstrlbutlon of the sample. Thls plot ls further
slnpllfled lf the lfentworth i.lze classes rre denoted by the notatlon
IXiurnbeln, 1936] ln rhlch l, -1og2 dlanreter In nrnr. Uslng thls
logarltlmlc scrle the frequency dlstrlbutlon cln be plotted on arltlmetlc
co6rdlnate Prper. Havln'g plbtteO cumulrtlvc frequency curves for the
dlstrlbutlon, the nedlan dlameter on other deslred paraneters can. readlly
be detennlned ln the flelrt [lnman, 1952].
STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA FIGURE 7O7
DESIGN PROCEDURE
FOB HIGH GRADIENT
SC HEMATIC
CHAN NELS
DATE:
REV:
REFERENCE:
STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA FTGURE 7.O8
WIDTH TO
SOLUTION OF
DEPTH RATIO EOUATION
b
v
2
3
4
5
6
8
to
tz
t4
t5
t8
20
n
---.
rt^
( g sycl'a
3.8?
4.82
5 .76
6 .72
7. 69
9. 64
il.6
t3. 6
t5.6
t7.5
r9. 5
21 ..5
b
v
o t5
(t#G#)'a
DATE:
REV:
REFERENCE:
o
o
o
STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA FIGURE 7O8
WIDTH TO
SOLUTION OF
DEPTH RATIO EOUATION
b
v
2
3
4
5
6
I
to
tz
t4
l6
t8
20
Ol ,+,'1,lg )y., -
3.8?
4.E2
5 .76
6 .72
7. 69
9. 64
lt .6
13. 6
t5.6
r7.5
19.5
21. 5 b
v
o t5
(t#tt#rh
DATE:
REV:
REFEBENCE:
a
WRICHT WATER ENCINEERS, INC.
2490 .West 26th Are.-fe rOO-n
Denver, Colorado 80211
Tel. €03)480-1700
Subiect
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Denver, Colorado 80211
Date Je.';e /?9 Sheet 9 of /O
ftsi. 1,i6. Ee/_- UU?:OOO
Proj. Name:€.4
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, tos-tngB|os tounty Tlo0i Control llistrlct
IIYDRAUTIC
llarch lg82
2250llcurr Strmt
los lrgrlos, Crllfonlr
?.0. lor 2110, Tcrnlnrl llner
Lor lrgrhs, Grlllorrlr 00051
J
1
I
I
I
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Prge C'10
C-2 tJrtcr Surfrcc Profile Crlculet lons cont Inucd.
C-3 Curving Al ignments
C- 3. I Superclcvat lon
l{yd. tlrn.
lt. lf, r! thc up.trc.n cnd of thc plcr, no dcpth cen bc
found to brlencc thc P + lt cquatlon, erlculeta P + fl
for thc dcpth of flow Just outr idc thc uPstre cnd of
thc pler end lts t.qucnt dcpth. lf thc loh,cr stagc
rcsults in thc grc.tcr surn (P + H), thls Indlcates N
hydreulic jmp rt thc up3tr.e frco of thc picr. lf
thc uppcr itrge rcsults In the grc.tcr sum (P + t{),
thls ind ieetes r hydraul ic j u:tp tonc distancc uPltr.am
f rorn thc picr. Assrnp crltlcal dcpth just insidc thc
upstraarn pler facc and gontlnuc thc watcr surface to thc
dovrnst rcan end of the pier, rnd thcn celculalc thc
dcpth just outridc thc picr by eithcr the P + f'l cquat ion
or thc Ecrnoul | | cquation.
Superelcvat ion ir the rise in watFr surfac. at the outer lrall
above the rnean depth (D) of flow in an cquivalenl gtraight
reach, cauSed by centrifugal force in a curving alignment.
a. Rectanqu I ar Channels
For subcriticel velocity, or for supercritical vclocity
whcre e stable trangversc slope has bcen attaincd 5y an up-
Strcem cascment curve, the maximurn superelcvaticn (S max) can
be calculated from thc fol lowing cquation:
s max - v2b fr
l*
t
Pag€ c-ll
C-3 Curving Al ignilcnt3 continued.
I
I
I
I
I
I
I
I
I
For guporeriticel vclocity in the ab3cnce of ln upstrcem caiement gsrvc, the nlxirnum rupcrclcvltion (S nex) it given by thc fol lowing cqurtion:
smr*.&
. 9r
whcrc V - Velocity of thc f lo,v cross iection, in f.p.g.
b - Width oi thc channel, in ft.
g - Acccleration duc to EravitV
r - Radius of channel center line curvc, in ft.
b. Trapczo ide I Channcls
For subcritical vclocity, the ,raxiaun superele.rat icn (S 'rrax )can be calculated fronr the fol lowing cquat;on, and ineludes e l5 perccni factor of safety.
s max - t.t5 vz(b+2zo)T
where z . cotangent 9f b6nk slope (ic: Horizontal to Vcrtical
Rat io)
b --hannellotlom width, in ft.
For supcrcritical velocity, curvin-o aligntnents shal I have
cagement cuEvcs with a maximun sugerclcvalion (S o:x) given by the following cquation:
S nax . 1.3 v2(u+229;--''--
A !0 perccnt faclor cf sefe:y is includcd.
Hyd. t''tan.
DRAINA6E CRITE HAITIUAL
a
RIA
:,.t ;,t /'f ' )
TAJOR DRAINAGE
5000
T I -J
at
tooo
?00
r00
700
6oo
500
.oo
300
?30
zoo
r!0
too
ta
50
25
rO
t
F o o
l!
9 !))o
E
LJ
o-
(^o z f
t+
rtl I
9
o o
=D o c
=lr,z o F o
J
<T I E
l^J I o,o
l!o
F
I I Ll
3
From
tto
BOTTOM VELOCITY
USBR
FIGURE 5.I.
15 ao
IT{ FEE' PER SECOND
RIPRAP SIZING (I3)
t?-t5-68
Drnvar lagcncl Cencil ol ooylrnmalr
,IOTE
Thc riprop lhoutrt b! comaoccd ol o
rcll grodrd nrrturc bul mosf of
fh? slont3 rhoutd Dr ol fhc sirc
mdicoled by tm curv!.
rgcsl 3lone dromtl ?r
t{oTEs
Curve s hors minimum size
stones n?cessontr lo
resisl move me n l.
Curve rs lenloiive ond
sublect fo chonge os o
r!sull of fulher tests
or openoling c rperic nces.
F pornls ore pfololtp?
riprop instollotions
ryhrch foiled.
S points ore sotisloctory
instollofions.
3S
I
5F
I '4,i
lr:ilT t:oiJ/
vl o6F
ii to
(J
=
=E
lrl )- 2a t!:
s o
t!z o
['t
flfs0 r"; 0 91990 E
wright watel Engineers, Inc.
DENVER OFFICE
2490 West 26th Ave., Suite 100 A
Denver, Colorado 80211
($3) ,$e1700
CLENWOOD SPRINCS OFFICE
818 Colorado Avenue
P. O. Box 219
Glenwood Springs, Colorado 81602
(n3l 94s-77ss
Denver Direct Line: 893-1608
July 3, 1990
Mr. Michael Mollica
Town Planner
Town of Vail
75 South Frontage Road
Vail, Colorado 81657
RE: I-ot 10, Block 1, Vail Filing Number 1
Relocation of West Mill Creek
Dear Mr. Mollica:
Wright Water Engineers is the design engineer for the relocation of West Mill Creek on
l-ot 10, Block 1.
I, Dr. Ronald R. Rossmiller, P.E., made a final construction inspection on July 3, 1.990, and
found that the construction work generally conforms to the design.
During my inspection of the channel on July 3, 1990, with the contractor, Schaeffer
Construction, Inc., I pointed out two items needing some additional minor work and notified
Schaeffer Construction that the project was acceptable to WWE.
It is in my opinion that the channel design and construction satisfu the request of the
United States Army Corp of Engineers regarding their #4M Permit.
Very truly yours,
WRIGHT WATER ENGINEERS
RLR/smg
cc: Robert Gunn
(Ltr22.RLR)
891-022.000
tb'r^;
'"Irtn z
resolution with the wording change in H. was made by Tom Steinberg and seconded by
GaiI Wahrlich-Lowenthal. A vote was taken and the motion passed unanimously 4-0.
The next agenda item was the Sober! :Qgnr:equest for a front setback variance and
modificatj6n of the 100-year IjTl--ei-Creef floodplain (342 Mi'll Creek Circle). Mike
Mollica explained the applicant's two requests, then reviewed the criteri a used in
these requests. He stated staff recommended approval of the variance request
because it would create a hardship on the app'l icant if it was not granted. As far
as the floodplain modification, staff recommended approval w'i th three conditions:
1. That a permit from the Army Corps of Engineers, ejther and Individual or a
Nationwide Permit, be obtained prior to the issuance of any bujlding
permjt for the ProPertY.2. That approval from the Federal Emergency Management Agency be secured
prior to the issuance of any building permit for the property.
3. That a groundwater analysis be completed, as an addendum to the EIR, prior
to the issuance of any building permit for the property. Said analysis
shall conclude that there will be no adverse affect on adjacent properties
regarding the issue of groundwater.
He then noted the P1 anning and Environmental Commission recommended unanimous
approval of the stream modjfication and the front setback vari ance. Mike then
stated the 250 square foot request was tabled untiI the next PEC meeting at the
applicant's request. The PEC was opposed to the applicant's 250 request and was
about to motion for denial of the 250 request when the appljcant requested tabling;
the PEC voted unan'imously for tabling. He then read a letter from Mr. Higbje
opposing the stream modification and noted he had received letters ear'l ier from two
others in favor of the stream modification. Mayor Rose commented the Council called
this issue uo to discuss and undenstand it more. Jim Morter of Morter Archjtects,
representing the applicant, felt the 250 square foot request could be put to rest
because nothing could be done until the applicant went through the Design Review
Board. He stated the applicant wou'l d be within the a] lowed GRFA without requesting
the additional 250 square feet, but they did want the ability to go through the DRB.
Council had some d'i scussion on the 250 GRFA. Tom Steinberg stated he would only
agree to approval if the applicant agreed not to apply for the additiona'l 250 square
feet before the five year 1imit. Jim Morter stated the applicant did not need the
250 square feet and was with'i n the GRFA al'l owed. Larry Eskwith explained what the
250 ordinance would al'l ow; there was more discusslon. Jim Morter reviewed the
problems of bujlding on the lot and how it came about. He remarked why it was a
hardship and showed how they would change the stream flow; he then reviewed the
relocated creek and how jt would be improved. BilI Ruzzo discussed the technica1
aspects of moving the creek. He stated they had turned in the report and analysis
to Mike Mollica this evening for the first and third conditions required by staff.
Regarding the second condit'i on, FEMA approval , they were in the process of making
application at this time. They had met with the Regjon Director in Denver and had
submitted the required forns. Technica] ly, the app'l icant was not encroaching into
the 100-year floodplain, but they will proceed for the map line revision due to the
creek relocation. He asked Counci] to change the condition so as not to depend on
approval for a building permit. Mike Mol'l ica agreed; they would change to an
occupancy perm'i t instead of a building permit. There was some discussion of a
sediment problem during construction, to which Mike Ruzzo responded. Jim Morter
commented Mrs. Gunn wanted'i t in the record that any trees damaged for a period of
up to three years after the construction (as a result of the construction) will be
rep'l aced. A motion was made by Gai'l Wahr'l ich-Lowentha'l to approve the request for a
front setback variance and modification of the 100-year f'l oodplain because of
staff's findings that this will not grant a special privilege and will not injure
the public's health; also, the variance is warranted because the strict
interpretation of the guidelines would produce a hardship for the applicant; also,
that approva'l be granted in accordance with the staff recommendatjons in their
memorandum to the Planning and Environmental Commission dated April 24, 1989, except
to modjfy condition no. 2 to change the wording from a building permit to an '\\tirit
occupancy permit. The notion was seconded by John Slevin. A vote was taken and the
motion passed unanimously 4-0. Tom Steinberg asked staff to bring back the 250
ordinance for evaluation. After some discussion, it was decided to review general
GRFA items at the next Council Work Session. Gail suggested Council needed to do
site visits to identify what's right and wrong, and do it when alI seven Council
members were here. Staff agreed this would be addressed sometime in June.
The fourth order of business was the-IJjlzL-en-and-Pj€rce--appea'l of the Planning and
Environmenta'l Commlsslon decision to deny a slde setback variance request (2998
l{111tlltl l\il i r l\\ [
-2-
TO:
FROM:
DATE:
SUBJECT:
Town Council
Community Development Departrnent
May 16, 1989
A request for a variance from the 20 foot front setback requirement and a request to modify the West Mill Creek LOo-year floodplain, to aLlow for the construction of a primary/secondary residence.Applicant: Robert and Francis Gunn
Backqround:
The Planning and Environmental Conmission reviewed the above
named requests on April 24, 1989 and made the following rnotions:
l-. To approve the front setback variance reguests. The vote
was 5-O for approval .
2. To approve the strearn modification request with the three conditions as recornmended in the staff memo. The vote was 5-0 for approval.
3. To table the 250 request until the next PEC rneeting at the applicant's request. The PEC lras opposed to the applicants
25O request and was about to motion for denial of the 250 reguest when the applicant requested tabting. The vote was 5-O for tabling.
At this meeting, it was understood by the PEC that they had the authority to act on all three reguests. However, after further review was made of the 250 ordinanse, it became evident that all 25o requests shall be reviewed and acted upon by a combination of the staff and the DRB. The PEC has no specific jurisdiction over the granting of additional square footage under the 25O sguare foot ordinance. However, they may use the fact that an applicant is reguesting additional square footage in deciding upon variance requests. This was explained to the PEC at their May 8, L9g9 meeting. The majority of the PEC members felt if they had known they could not vote on the 250, they would have voted for denial of the variance reguests.
On April 25, L989, the Town Council called up for review the pEc
decisions stated above.
TO:
FROM:
DATE:
SUBJECT:
Planning and Environmental Commission
Connunity Developnent Department
April 24, l-989
A request for a variance fron the 20t front setback
requirement and a request to modify the West Mill Creek
100-year floodplain, to allow for the construction of a prinary/secondary res idence.Applicants Robert and Francis Gunn
I.DESCRIPTION OF REQUESTS
The applicants are the owners of Lot J-0, Block L, Vail Village First Filing, which is located at 342 MiIl Creek
Circle. The property has an existing single fanily residence
located upon it, with a building footprint of 1o4o square feet. The owner is proposing to demolish and remove the existing structure, and to construct a new primary/secondary
residence with a footprint size of 2,LLL sguare feet. The applicant has reguested the use of Ordinance #36/L988 for an
additional 25O square feet of GRFA.
A. The proposed building would require the following
variance:
Front Setback:
To allow a building encroachment of 12 feet into the required 2O foot setback.
2l To allow a patio and exterior steps to encroach 6
feet into the required l-0 foot setback.
It should be noted that the existing residence on this lot currently encroaches l-l- feet into the front setback.
B. The second reguest is to rnodify the l00-year West Mill
Creek floodplain by relocating the creek channel to the east (30 foot relocation at the furthest point). This
relocatj-on would enable the proposed structure to be
constructed entirely out of the 30 foot creek setback
and the 100-year floodplain.
II. CHRONOIOGY
The Planning and Environmental Comrnission reviewed the above
named variance requests on February 27, l-989, and by a vote of 4-3 approved of the reguests with the following condition:
That the northeast section of the lot be deed restricted to prohibit any future development. The three dissenting votes
were cast prirnarily due to the applicant's reguest for an
additional 250 square feet of GRFA.
e
@
1)
On March 7, L989, the Town Council requested a review of the
PEC decision, however, subsequent to the Council review, the applicants fonnally withdrew their variance application and
have submitted a revised reguest as stated above.
III. ZONING CONSIDERATIONS
Zone District: Priurary/Secondary Residential Lot Size: 0.4052 acres/L7,651- square feet
Maximum GRFA: 40L5 sq ft (+250 sf,'Ord #36/L988 = 4265 sf)
Proposed GRFA: 4L88 sq ft
IV. CRITERIA AND FINDTNGS
Upon review of Criteria and Findings, Section 18.61-.060 of the municipal code, the Department of Community Development
recommends approval of the requested variance based upon the following factors:
Consideration of Factors:
A.The relationship of the re ested variance to other
exisL or potent aI uses and s ures the vicinitv.
Front Setback Variance
Residences along the interior of l,[ilt Creek Circle have historically been located in close proxinrity to their front property lines which are nearest the road. l,lany of the existing homes in this area encroach into their
respective front setbacks and a few structures are even located across property lines. The effect of
uraintaining these structures on the outer edge of the Circle is the creation of a large rropen spacerr area on the interior of the Cj.rcle. This rropen spacelr area is utilized as a view corridor toward the Gore Range by
some of the property orf,ners.
The Department of Community Development believes that the requested front setback variance would not adversely affect the privacy of use of any adjacent properties.
The najority of the existing trees along Mill Creek Circle will be naintained in their present location and a felt will be slightly relocated, thereby preserving the strong landscape buffer along the south property line.
Allowance of a front setback encroachment on this site would also ensure the preservation of the rnature
evergreen and aspen trees located irnnediately north of the existing residence.
The to which relief from the strict and literal
n retat on and enforcement of a specified requlation
B.
IS necessary to achieve compatibility and unifonnity of
v.
treatment arno the vicinit or to atta
obiectives of th st tle without crrant of s privileqe.
The 30 foot strearn setback has reduced the buildable
area of this lot by approximately 52&, and has certainly
created a physical hardship upon redeveloprnent of the site. Staff believes that approval of the requested
variance would not be a grant of special privilege due to the unique development restrictions on this lot and the historical building sitings on the circle.
C. The effect of the requested vari
facilities, public facilities and utilities, and public
safety.
This variance reguest, if approved, would not block any light or air on adjacent properties and its overall effect would be to preserve the Itopen spacetr view corridor area, inmediately north of the residence.
Such other factors and criteria as the conmission deems
FINDINGS
The Planninq and Environmental Commission shall make the followinq findinqs before grantinq a variance:
That the granting of the variance will not constitute a grant
of special privilege inconsistent with the linitations on other properties classified in the same district.
That the granting of the variance will not be detrimental to the public health, safety or welfare, or rnaterially injurious to properties or improvernents in the vicinity.
That the variance is warranted for one or nore of the following reasons:
The strict or literal interpretation or enforcement of the specified regulation would result in practical difficulty or unnecessary physical hardship inconsistent with the objectives of this title.
sjue-zane.
The strict interpretation specified regulation would privileges enjoyed by the the same district.
or enforcernent of the
deprive the applicant of
owners of other properties in
VI . FLOODPI,AIN MODIFICATTON
The tOV hazard regulations specify the criteria for
rnodification to ttre floodplain:
Section L8.59.040 (E) Developnent Restricted
rrThe zoning administrator nay require any applicant or
person desiring to rnodify the floodplain by fiII,construction, channelization, grading or other sinrilar
changes, to subnit for review an environmental inrpact
statement in accordance with 18.56 to establish that the
work vill not adversely affect adjacent properties, or
increase the quantity or velocity of flood waters.rl
An environmental irnpact report has been subrnitted by lVright
l{ater Engineers, Inc. (dated March 31, L989) and the pertinent sections of the report are as follows:
rrstorm Runoff creater Than Design
The proposed creek alignment and cross section are
designed to carry the storrn runoff from the sOo-year storn event. In the case of a more severe storm with greater discharges or due to blockage of the existing
60rr RCP, there is the possibility of danage occurring
frorn the discharge exceeding the capacity of the channel
or from overtopping of the Mill Creek Circle. Due to the local terrain, the flows would spread out as shallow
flow and meander throughout the property. Because the
proposed structure is closer to the original creek
locatj-on and in more direct tine with the upstream creek, flooding of the structure is possible.
Construction Related Sediment
Construction of a new channel may provide a source of additional sediment. Sediment sources will be frorn the actual construction of the new channel and from the
channel itself, until a stable condit,ion is reached over
tirne. This process will be reduced by the use of rock
lining in erosive areas of the channel. In addition,the small pools created by the rock drops wiII help to collect the sediment until the channel has a chance to
stabilize. rl
An addendum to the environnental inpact report, dated Aprit 6, 1989 concludes:
rrBased on our assessment of the West MilI Creek, the
proposed relocation will not adversely affect adjacent properties, or increase the discharlte or velocity of the
l00-year floodwater in the Creek.tl
VII. STAFF RECOMI.TENDATION
The staff recommendation is for approval of both the variance
reguest and the floodpJ.ain modification.
Variance Reguest:
The applicant has shown that this site possesses a unique physical hardship with the location of the stream corridor on the l-ot and the mature trees. staff believes that a hardship
would be inposed upon the applicant if the strict interpretation of the zoning code were to be enforced.
Floodplain Modif ication :
The Department of Cornmunity Development aqrees that this site presently exhibits some very difficult development restrictions, given the location of MiIl Creek as it bisects the 1ot. The relocation of Mill Creek to the east would allow for construction of a new prinary/secondary residence
completely out of the 30 foot creek setback and the
conclusion of the EIR is that adjacent properties would not
be negatively iurpacted. The applicants have also agreed to
complete extensive landscape irnprovements along both stream
banks throughout the length of their lot and to never develop their property on the east side of MilI Creek.
The staff recornmendation for approval of the floodplain modification includes the following conditions:
1) That a pernit frorn the Anoy Corps of Engineers, either
an Individual or a Nationwide Perrnit, be obtained prior
to the issuance of any building permit for the property.
2) That approval frorn the Federal Ernergency Management
Agency be secured prior to the issuance of any building permit for the property.
3) That a groundwater analysis be completed, as an addendum to the EIR, prior to the issuance of any building pernit for the property. Said analysis shall conclude that there will be no adverse affect on adjacent properties
regarding the issue of groundwater.
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ORDINANCE NO. 36
Series of lgEii-
AII ORDINANCE AI'IENDINC CHAPTER I8.7I OF THE IITIJNICIPAL CODE OF IHE
TO{N OF VAIL TO PROVIDE THAT SINGLE FA,'IILY DI{ELLINGS IIHICH ARE
TOTALLY REI4OUED AI{D REPLACED SHALL 8E EI{TITLED TO BE COIISIDERED FON
IDOITIONAL CROSS RESIDENTIIL FLOOR AREA ACCOROING TO TIIE TER!4S OF
SAID CH,APTEN; AilO SETTING FORTH DETATLS Til REGARD NIERETO.
' IIHEREAS, tie Town Council rlshes to specify that Slngle Fanily Dwalllngr that
hrve bcen completely renoved and replaced shall be €ntitled to be consider.d for
edditional GRFA pursuant to thc terns of Chapter 18.71 of the l'lunicipal Codc of tho
Torn of Vail.
1{0U, THEREFoRE, 8E IT oR0AINED BY IHE TO!n{ CoUNCIL 0F IHE T0}rl'l 0F VA[L.
c0L0RA00:
l. Section 18-71.010 is hereby ardended to read as follor{s:
18.71-010 Puroose
The purpose of this Chapter is to provide an inducenent for the upgtadlng
of single fanily dwellings and drelling units which have been in eristence rithin
the Town of Vail for a.period of at least five (5) years by pernittinE thc rddition
of up to tro hundred fifty (250) square feet of gross residential floor arct
("GRFA") to such single family dwellings and dwell ing units, provided the criteria
set forth in thls Chapten are met. This Chapter does not assure each single family
dwelling or dwelling unit located within the Town of Vail an additional tro hundred
fifty (250) square feet, and Droposals for any addltions hereunder shall bc rcviewcd
closely Hith raspect to site planning, inpact on adjacent properties, and applicable
Torm of Vail developnent standards- The 250 sguare feet of additional GRFA may be
granted to single fanily dwellings, hro fanily and nulti-fanily fuelling units only
once, but nay be requested and granted in more than one increment of less than 250
rquare feet. Upgrading of a sinEle family dwelling or a dwelling unit under this
Chapten shall include additions thereto or renovations thereof, and in rlgard to
single fanily dwellings, the conpleEe removal of the building and its foundation and
the replacenent tiereof with a new foundation and building.
2. Section t8.71.0?0 ls hereby anended to read as follons:
18.71.020 Slngle Farnily Drellings and Two Familv Dwellings
. Any single fanrily dwelling or dwelling unit in a two family dwel'l ing not
restricted by the Town of Vail to housing for full tirne enployees of tha Upper Eagle
Valley shall be eligible for additional GRFA nol to exceed a maximun of 250 square
fe.t of GRFA per single family dwelling or tuo fanily dwelling unit ln addition Eo
(E-
a
f,r rr lstl nl GRFI ot
't10
ths allowable GRFA for the site.
single fani'ly dwelling or dwelling
,o
Before such addi tional GRFA
unit shall meet the folloring
(
Grr bt granted' the
cti teri a:
l. At laast flve years nust have passed fron th! date the single fanily
dwclling or two farnily dwelllng rinit was issued a temporary certiflcate of occupancy
or a ninimun of six years nust have passed from the date th. original buildlng
pernit was lssuad for tha construction of the dwelling unit.
B. -
The single iarni l y dwelling or dwelllng unit shall have receivcd its
finirt 'i"iti tidit" of oc"up"n"y. '""'
C. Proposals for the utilization of the additional GRFA under thts
provision shall conply with rll Tow; of vail zoning rcqui rernents and applicable
developnent standards. If a variance is required for a proposal' it shall be
.pproved by th" Pl "nl i
before an application ls made in accordance with this chapter. Any single farnily
dwelling or tHo family dwclling'which ls totatly renoved shall: l) be replaced with
rny prior existing nOnconfonnlng uses or development standards totally .llninated:
2) obtain a buildinq permit within one year of final Design Review Soard approval or
the aooroval for additional GRFA stiall be voided: 3) be allowed a maximun of the
GRFA allowable by zoning plus a maximum of 250 additional square fee!'
D. Adjacent property owners and olrners of dwell ing units on the sane lot
as the applicant shall be notifjed of any appl ication under this Chapter that
lnvolves any external alterations to an existing structure. llotification procedures
shall be as outlined in Section 18-66-080 of the zoning code-
E. If any proposal provides for the conversion of a garage or lnclosed
p""iing a""" to GRFA, such conversion vril l not be allowed unless a new Earag! or
Cnclosed park.ing area is also proposed. Plans for a new garage or enclosed parking
trea shall accompany the application under this Chapter, and shall be constructed
concurrently with the convers i on '
F. Any increase in parking requirements as set forth 'in Chapter 18-52 due
to any GRFA addition Pursuant to this Chapter shall be net by the applicant.
G. All proposals under this Section shall be required to confonn to the
Design Review Guidelines set forth in Chapter 18'54 of the Vail Municipal Code- Any
.Slngle farnily dwelling or dwelling unit for which an addition is proposed shall be
raquired to meet the nininun Town of Vail landscaping standards as set folth in
Chapter 18.54 of the Vail llunicipal Code. Before any additional GRFA nay be
pennitted In accordance with this Chapter, the staff shall review the naintonance
-2-
I GE
O
end upkeep of the existlng slngla fanil lI'ing or dwelllng unit and
Including landscaping to d€termine whether they comply rith the Design
Guidelines. No temporary c€rtiflcate of occupancy shall be issued for
of GRFA pursuant to this Chapter untll all required lnorovenents to the
rny extansion
site and
structure have been conpl€ted as required.
H. The provisions of thls Sectlon are applicable only to GRFA addltions
to single dwelllng units. l{o pooling of gross residential floor area shall be
allowed in single fanily dwellin9 or two fanily residential dwellings units. No
rpplication for additional GRFA shall r.quest more than 250 square feet of gross
residential floor area per single farnily dwellinq or dwelling unit.
3. Section 18.71.030 of the Vail Municipal Code is hereby amend€d to read as
fol I ows:
f8.71.030 Mul ti -Fani ly Dwellings
Any dnelling urit ln a multi-fanily dwelling shall be eligible for
additional GRFA not to excsed a maximun of 250 squafe feet of GRFA in addition to
the existing GRFA or the allowable GRFA for the site. Any app'l ication for such
additional GRFA must rneet the following criteria:
A. At Ieest five years must have passed forn the date the buildinE was
issued a tenporary cert'ificate of occuoancy or a minimun of six years nust havo
passed from the date the original building permit was issued for the construction of
the bui ld i ng.
8. Proposals for the utilization of the additional GRFA shall conply with
all Town of Vril zoning requirements and applicable develoDnent standards- If a
variance is required for the additional GRFA, it shall be approved by the plannirg
and Environmental Comnission pursuant to Chapter 18.62 before an applitation is nade
ln accordance Hith this Chaoter.
C. The buildinE has received its flnal certificate of occugaacy.
0. Portions of eristing enclosed parking areas nay be conyerted to GRFA
under this ordinance if there is no loss of existing enclosed parklng spaces in said
anclosed parking area.
E. Any increase in parking requirements due to any GRFA addition pursuant
to this Chapter shall be met by the applicant.
. F. All proposals under this Section shall be reviewed for conpliance with
the oesign Review Guidelines as set forth in Chapter 19.54 of the Vall Hunicipal
Code. Erisring properties for which additional GRFA is proposed shall be required
to meet nininun Town of vail landscapinE standards as set forth in section lg.s4 of
o
y dwo
(O
si te,
Revie|i
-3-
t-rEr
':;=/ O (o b ':/ o AF/ ''- '-:F/rn, vzi't llunicipal Code. General naintenance and upkeeo of existing buildings and
sites, including the nulti'family dwelllngs, landscapinE or site improvenlnts (i.e.,
trash facilities, benning to screen surface parking, etc.) shall be revi ewed by the
staff after the application is made for conformance to said Desjgn Revier
'Guidelines. This review shall take place at the tine of the first aDDlicatlon for
additional GRF in any multi-family dwellinq. This review shall not be rrguired for
any subsequent app'l ication for a period of five (5) years from the date of the
lnitJal application and review. but shallbe required for the first application
'filed aften e.ch subsequent five (5) year anniversary date of the initirl rcview.
l{o tenporary cerlificate of occupancy shall be issued for any expansion of GRFA
pursuant to this Chapter until all required improvenenrs to the multi-family
dwelling site and building have bsen coDpleted as required.
G. If the proposed addition of GRFA is for a dtrelling unit located in a
condominium project, a letter approving such addition ftom the condominiun
association shall be required at the tlne the application is subnitted.
H. l{o deck or baicony enclosures, or any exterior additions or
alterations to Dulti-family dnel'lings with the exception of windows, skylights, or
other similar nodifications shall be allowed under this Chapter.
l. The provisions of this Section are applicable only to GRFA additions
to individual dnelling units. I'lo "poolin9" of GRFA shalI be allowed in nrulti-fanily
dwellings. llo application for additional 6RFA shal l reguest more than 250 sqtare
feet of gross residential floor area per dwelling uni!.
4. Paragraph 18-71.040c is hereby am€nded to read as follows:
18.71.040 Procedune
C. If the Codnunity Development Department staff determines that the site
for which the application was subnitted is in compliance with Town of Vail
landscaping and site inprovement standards, the applicant shal l proceed as follows:
l) Applicalion for GRFA additions which involve no change to the
exterior of a building shr'll be reviewed by the Comnun i ty Development Oepartnent
staff.
Z') Applications for GRFA additions involving exterior changes to a
building shall be reviewed by the staff and the Design Review Board iD aceordance
with the provisions of Chapter 18.54.
5. Chapter 18.71 is hereby amended with the addition of Section lg.?l.0SO ro
read as fol I ows:
l--
.t 'c
18.71.050 App I ication
In the avent the owner of any single family dwelling rnade application for
edditional GRFA and was denied under prlor ordinance 4, Series of 19g5, b.causr tha
rxisting foundation of the single fanrily dwelling was not being retained, such
single fanily dwelling shall be deened to be in existence and the owner thereof
shall be entitled to apply for additional GRFA hereunder for such singre faniry
dwelling reEardless of whether or not such singre fanily dweling and its foundalion
were destroy€d or voluntari'ly demolished prior to the owner thereof mrking
eppl ication for- andlor receiving additional GRFA for sucn structure hereunder.
6- lf any pant, sectlon, subsection, sentence, c.lause or phrase of this
ordinance is for any reason held to be invalid, such decision shall not affect the
validity of the remaining portions of this ordinance; and the Town council hereDv
declares it would have passed this ordinance, and each part, section, subsection_
sentence, clause or phrase thereof, regardless of the fact that any one or nore
parts, sections, subsections, sentences, clauses or phrases be declared invalid.
7' The Town councir hereby finds, determines and decrares that this ord,inance
ls necessary and proper for the health, safety and welfare of the Town of vail and
the inhabi tants thereof.
8- The fepear or the repear and reenactment of any provision of the fiunicipal
code of the Town of vait as provided in this ordinance shar'r not aff€ct any right
v{hich has accrued, any duty imposed, any violation thaE occurred prior to the
effective date hereof, any prosecution comrenced, nor any other action or
proceedings as comnenced under or by virtue of the provision repealed or rapeiled
end reenacted- The repear of any provision hereby shalr not revive any provision or
any ordinanca previously repeal€d or superseded unless expressly stated herain.
INTRODUCED, READ AND APPROVED Ot'l FIRST READING this 6th day of December ,
1988, and a public hearing shall be held on this Ordinance oa the ,6th day of
December , 19gg, at 7:30 p,m. in the Council Chambers of the Vail
lilun i ci pal Euilding, Vail, Colorado.
Ordered published in full this 5th day of 0ecember 1988.
ATTEST:
-5-
Lorraine N. Higbie
355 Mill Creek Circle
Vail, CO 81657
April 19, 1989
The Town of VaiI
Planning Committee Vail, CO 81657
Dear Sirs:
I am enclosing a copy of my letter to you of Septenber 5,
which I understand you never received.
I am aware of Mr. Robert Gunnls proposal to relocate
Mill Creek on his property in order to solve the stream
set-back problem. I object to moving stream beds just to
accomodate developers for several reasons. First, this
is an ancient stream bed which ecologically should not be
tampered hrith. Second, a bad precedent is set by moving
a natural boundary such as a stream. Third, the stage is
being set for unattractive over-development of the resi-
dential- area of MiIl Creek Circle.
I am enclosinq some pictures taken last summer showing how
encroachment on the stream has left its scars. Apparently
The Town is unable to enforce appropriate clean-up and
beautification.
I trust that this proposal will be given careful study and
consideration.
Sincerely,
Aow..r-.-->, 4;2^a*
Lorraine N. Higbie
LNI{:9r
Enclosures
3*'i
T..rrr: i ne N- Hi crhi-g
355 Mil1 Creek Circle Vail, Co. 81657
September 6, 1988
The Town of Vail
Pl-anning Conunittee Vai1, Co. 81657
Dear Sirs:
I should like to reinforce my letter to you of July 7th
requestj-ng that no variances be granted for the 30-foot
stream set-back on Lot 10, Block 1, MiIl Creek Circle.
I think the Planning Committee should be aware of what an asset a mountain stream running through private and public property can be. Any encroachment on the set-back could
cause erosion and damag:e to the wetlands of the stream.If the stream were larger it would require an EPA permit proving that no damage to the stream would occur. The dirrcreian nf nart sf Mi1I Creek tO flow past the Golden
Peak ski school has diminished the stream flovr in the main-
stream, causing the banks to dry up and erode.
I em enclosing some photographs to illustrate how the beauty
and effectiveness of a natural stream can be quickly 1os-'
lrw err-rn:r-hmcn1- .3 '-.-: I r'i --^ '"|!..rsF oi r:trrr,.s .)= 14ili Cfggk ,.,J grr\,J-\Ja.\,rrrlrc:rrL \JJ- rJLl-L-r.tl-Ll.r\]D. Irrl,rs !J4eLu!were taken bet"rreen East Gore Creek Drive and Hanson Ranch
There are so few natural green spaces left in Vail that I think we should preserve the few that remain.
ainr.aralrr v-r.vers+-I ,
LllH: gr
Enclosures
Lorraine N. Higbj-e
2301 DOUGLAS DFIvE
SAN ANGELo. TExAs 76904
LON SLAUGHTER
P. O. BOX 1 508
SAN ANGELO, TEXAS 76902
April 7, 1989
I4r. Mike l4c1lica
Plann-ing frrgineer
Ttwn of Vail Vail, @ 81657
Dear Mike,
I an writing this letter qr behalf of my neiglibors,
Mr. and Mrs. Robert Gunn. Ivg wife and I v,ould like for
you to kno,tr that vte support the relocation of !{est l[ill
Creel< within tteir property. I{e feel this would be a
significant fuprorrerent aesthetically and safetlt^rise.
Thank you for your attenticn to this matter.
LS:sa
cc: l4r. Robert Gurul
(t,t r)
REs. PH. (915) 949{245
OFc PH (915) 658-7525
Siloerely,ffi,@
' tl
Olson Industries Inc.
Dlvldonr RobertsE Perf ection TapD Partrade
3888 E. 45lh Ave., Suite 310 Denver, Colorado 80216
(303) 399-4623 FAX (303) 320-0556
Pltrrrrirrl [r Elr', it r:nnt::rrtu1 lonnrj sr-,ir.;t'r
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5rrh,jr,r:t : \:;:,t.i rilt...j ne(_.lu(-.ri t
i-ut 10, ,!-, ir,.cil 1
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t:{' c::'rtli tl vo.I inttr:r:g c,rrr Lrrt 1l). ig ,.t 1,',r'i-',r h:,r.,'r: lir-,-.'rliir.,:r.f ,,,1 1., i'-i1iru,lr,s thjtl-
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l ir.
April 3, 1989
Mike MoIIica
Community Development Dept.
Town of Vail
75 S. Frontage Road Vail, Colorado 81557
RE: tot 10, BJ-ock 1, Vail Village First Filing
Dear Mike:
The purpose of this letter is to withdraw our Application
For A Variance dated January 30, L989, for the reference proPerty.
Our new application, dated March 27, L989, replaces the
January 30, 1989 application. The new application will be
heard by the Planning and Environmental Commission on Mon-
day, ApriL 24, 1989.
Thank you for your cooperation.
Sincerely,
Robert E. Gunn
cc: James R. Morter, AIA Phil Hoversten
Craig Denton
Rocky Christopher
ceorge Shaeffer
Dave Sage
r.
Morurn
Ylarch 27, 1989
LOT L0, BLOCK 1,
VAIL VILLAGE FIRST FILING
APPLICATION FOR A VARIANCE
For years the location of the existing home on Lot L0,Block 1", Vail Village First Filing (342 Mill Creek Circle)has establi-shed an important configuration of open space for the surrounding properti.es. This space takes the shape of a reverse "L", beginning with the land immediately north of the structure and continuing east and south to include all- of the lot east of Mill Creek.
The owners of the surrounding properties want dearly to maintain that open space. This reguest for a front setback variance maintains that open space, to everyone's benefit.
By relocating that portion of MiII Creek which is on his private property (see site ptan), the applicant is able to:
1. Improve and beautify the existing creek.
2. Design the creek to meet 500 year flood criteria, as
opposed to the existing 1-00 year flood design.
3. Increase the distance between the proposed home and the exj-sting home on Lot L1.
4. Eliminate the need for encroaching into the prescrib-
ed stream setback.
Granting this requested variance to paragraph 18.13.050 of the Town of Vail Zoning Ordinance wiII preserve the unique character of inner MiIl Creek Circle: a setting of openness
and excellent view corridors in all directions.
Granting this variance will acknowledge:
L. The desires of the neighbors.
2. The hardship imposed by MilI Creek's bisecting the property.
3. The applicantrs willingness to leave undeveloped roughly three-fourths of this developable property.
4. ?he fact that the proposed encroachment at the front setback is simil-ar to the encroachment of the existing structure, and indeed is similar to (or LESS
THAN) most of the homes on Mill Creek Circ1e.
*
MonrenAncnrECTS
March 27, 1-989
LOT 1_0, BLOCK 1,
VAIL VILLAGE FIRST E'ITING
APPTICATION FOR A VARIANCE
PAGE T!{,O
5. The applicant's conrnitment to never construct on his property on the east sid.e of Mill Creek.
A PrL ' e55,Ona alLiri.ioralron
l-:J f.1st l,4eadow Dr va
a 'ass.aads a1 var
vr r ao orado El65l
_.rtl t:6-4105
MonrER ARct--i I r[cTs
Letter nf Transmittal
r.,1-Apri1 17, 1989
Mike Mollica
Town of Vail
75 S, Frontage Road
Vai I , Col orado 81657
F l=
Lot 10, Biock 1, Vai I Vi I lage Fil ing 1
. _i !::
3/20/89
2/24/89
Geologic Hazards Evaluatjon, by Chen-Northern, Inc.
Lot 10 S'i te Plan, by Wright Water Engineers
The enclosed drawing 'i llustrates the 100 year flood plain' (the
proposed creek will actually contain the 500 year flood). The
grades at the creek are shown on the Profile.
There is no reasonable way to fill in w'i th building the sma'l I
crescent-shaped area to t-he east of the building. The proposed
design maximizes the building's setback from the creek (EVERY-
Oltf'5 goat frorn the outset),-and improves on the front setback
which [as already been approved by the staff and Planning and
Envi ronmental Commi ss'i on.
,'t ,//' ,I/',
.lamEr( R rter,
ARCHITECTS
AIA
ater Engineersr Inc.
@
Wright W
DENVER OFf ICE
2490 West 26th Ave., Suite 100 A
Denver, Colorado 80211
(303) 48G1700
TULSA OFf ICE
201 West 5th 5r.,suite 130
Tulsa, Oklahoma 74103
(918) 584-7136
GLENWOOD SPRINCS OFFICT
8'18 Colorado Avenue
P. O. Box 219
Glenwood Springs, Colorado 81502
(303) 945-775s
Denver Direct tine: 093-16@
April 6, 1989
Mr. Michael Mol I ica
Town of Vai I
75 S. Frontage Road
Vail, CO 81657
RE: Env i ronmenta I
Fi i ing I
Dear Mr. Mol l ica:
Impact Report for Lot 10 Block Vai I Vi l lages
f,lith regards to the Environmental Impact Report prepared by t,lright tlater
Enqineers, Inc. dated March 31, 1989, we would like to add the following
conclusion.
Based on our asseEsrnent of the West Mill Creek, the proposed relocation will
not adversely affect adjacent properties, or increase the discharge or
velocity of the loO-year f loodu.,ater in the Dreek.
If we can be of any further service in this matter, please feel free to
contact us.
Thank you.
Respectful ly submi t ted,
LIRIEHT IIATER ENGI
t^li 1l iarn
Sen i or
P. Ruz zo j
Project Eng
Gu nn
Mor ter
By
R.
J.
^ r, r.\q1.rr;' I irlirfd ro
,l _j
E as1 f,4FdlOw Jr \
'--a.'assrlads a1ta,
\ .r I i:..r r)ra,lD [J1E57 .: .: -ii., ,')!MonrrnAncn r-mcl-s
Letter of Transmittal
i-irle
l4arch 31, 1989
Mike Mollica
Conmuni ty Development Department
Town of Vail
75 S. Frontage Road Vail, Colorado 81657 :-.4' e _!
Mill Creek - Lot 10, Block I, Vail Village First Fiiing
Pleasi'f )'! tlric oscd tlc 1rL (]w nal
C:, rr::,
3/31/89
3/27 /89
r:e'1r,r'] Mr. GUnn Wi'l I
signed by him,
April 3.
Environmental Impact Report
Engineers, Inc.
}'lritten portion of Variance
Morter Architects
by Wright Water
Appl ication by
return to Vail this weekend.
voiding the first Variance
I'11 bring the letter,
Appl ication, on l4onday,
o o
DtrFMRTMtrNT @tr
tr@MMUNITV DtrVEt@FMENT
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ACCOUNT #
01 0000 41330 COM, DEV. APPLICAT]ON FEES
01 0000 41s40 ZONING AND ADDRESS MAPS
1 0000 4241s 1988 UNIFORM BUILDING CODE
01 0000 42415 1988 UNIFORM PLUMBING CODE
1 0000 42+15 1988 UNIFOR}J MECHANICAL CODE
01 0000 42415 1988 UNIFORM FIRE CODE
1 0000 42415 1987 NATIONAL ELECTRICAL CODE
1 0000 42415 OTHER CODE BOOKS
01 0000 41548 BLUE PRINTS (MYI_ARS)
01 0000 +z+rz lxenox coplEs / sruores
PENALTY FEES / RE-INSPECIION 1 0000 42371
01 0000 41322 OFF HOURS INSPECT1ON FE
CONTRACTORS UCENSES fEES
01 0000 41330
0l 0000 4r4r3 .SIGN APPLICATION
COMMENTS:
Appl ication O.r"
PEC MEETING OATE np"ir 4. rg8g
/0
APPLICATION FOR A VARIANCE
I' Thr's procedure is.required fgf qny project requesting a variance. The application will not be accepted until all infoirnaiion is'submitied.
A. NAI'IE 0F APPLICANT Robert and Francis tunn
ADDRESS 332 Mill Creek Circle
Vail. Colorado
NAME OF APPLICANT'S REPRESENTATIVE Morter Architects
ADDRESS
pHgNE 476-4648
B.
143 E. lvleadow Drive
.Vai'l , Colorado pHoNE 476-5105
c.NAME 0F 0WNER(S) (type or prin Robert and Francis Gunn
S i qnature
ADDRESS 332 Mill Creek Circle
PHoNE 476-4648
LOCATION OF PROPOSAL
ADDRESS 342 Mill Creek C'ircle
D.
Col orado
LEGAL DESCRIPTION LOT 10 BLOCK 1 FILING Vail Villaqe Firsi
E.FEE
THE
YOUR
re$KsE
PROPOSAL.
,'
pllD rcfir cK # 197 FRoM Robert D. Gunn
PAID BEFORE THE COMMUNITY DEVELOPMENT DEPARTMENT l,lILL ACCEPT
F. A list of the names of owners of all property
INCLUDING PROPERTY BEHIND AND ACROSS STR'EETS-,
THE APPLICANT I.tILL BE RESPONSIBLE FOR CORRECf
II. A PRE-APPLICATION CONFERENCE t,tITH A PLANNING STAFF MEMBER IS STRONGLY SUGGESTED TO DETERMINEIFANY'ADDITIONAL INFORMATION IS NEEDED. NO APPLICATION l,lILL 8E
ACCEPTED UNLESS IT-IS^COHPLEIE (MUST INCLUDE ALL
'TEMS
REQUIRED BY THE zONING
IPIINiSIRAI9E). IT IS THE APPLICANT's RESPoNsIBILIiy To MKE AN AppoTNTMENT ltlITH THE S-TAFF T0 FIND OUT ABOUT ADDITIONAL SUBMirinr- nequJfiElrEliis.'--":"'
PLEASE N0iE THAT A cOl,iPLETE AppLIcArIoN t,tiLL srriEAt"tLINE TltE AppRcvAL pRccEss FoR
YOUR PROJECT ev DecRmsJNE-THE NuuBER oF coNDrrlorus-or nppnovAl THAT THE pLANNING
AND ENVIRONMENTAL_c0l'lMIssI0N MY STIPULATE: ALa-conorrtolrs 0F AppR0vAL MUST BE . COMPLIED WITH BEFORE A BUILDING PERMIT IS ISSUED.-. ;. :. i ,
III. F0UR (4) COprES 0F THE FOLL0WING MUST BE SUBMITTED:
A. A WRITTEN STATEMENT OF THE PRECISE IIRTURT OF THE VARIANCE REQUESTED AND THE
REGULATION INVOLVED. THE STATEMENT MUST ALSO ADDRESS:
l. The relationship of the requested variance to'other existing or potentia'l . uses and structures in the vicin.ity.
2. The degree to which relief from the striet or literal interpretation and enforcement.of a-spec'ified regulation is necessary.to achieve compatibility and uniformity of treatment among sites in the viitnitv-ij"-io iliuin tte objectives of this title without grant of speciar privitege.
adjacent to the subject property
and thei r mai I i ng addresses.
MAILING ADDRESSES.
OVER
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to 6:00 AM. This parking agreenent must be in a form that
may not be arnended or rescinded without the approval of the Town of Vail .
vote was 6 in favor with Jim Viele abstaining.
4.request conditional rnit and
varLance for an oltlce sDace e Vail Va1 Council onshead Par Structure.l icant:I Valley Arts council and Town of Vail
Mike Mollica presented the staff memos on the conditional use and parking variance requests. A notion was made by peggy and seconded by Kathy to approve the parking variance. The vote was 7-O in favor. A urotion was made by Kathy and seconded by Peggy to approve the conditional use perrnit. The vote was 7-o.
5.est for a side setback variance in order to construct a e on Lot 20 Block 7 e First Fil inq.Applicants: Peter Tufo and Gary Bossow
Rick Pylnan explained the request and stated that the staff
recommended approval . Pam moved and Chuck seconded to approve the request. The vote was 7-o in favor.
6.A reguest for a stream setback and front setback variances for Lot 10, Block I, VaiI Villaqe First Filino.Applicant: Robert and Francis Gunn (Hoversten)
ke Mollica gave the staff presentation recom:nending approval of the front and side setback variances. He cited compliance with the variance criteria and noted that the applicant had reduced the amount of variance requested on the stream side.Mike added that there ltras some public input frorn the neighbors and specified what that was. Jim Morter, representing the applicant, stated that the appticant was Phil Hoversten and not the cunns. He pointed out how the proposal was rnaintaining inportant open space and landscaped areas on the site and f,hat the buildable area was very small. He added that the Higbies had not yet seen the most recent plans.
Mrs. Olson, an adjacent property owner, spoke in favor of the proposal .
Kathy had no problem with the setbacks, but did have a problem with using the 250 ordinance. PeSgy agreed with Kathy and sid. Diana also had a problem with using the 250 ordinance.She inquired about snow removal (was told there was adequate area), and preserving the six aspens (was told 33 trees were being preserved).
landscaped. Kathy agreed. Jiro Viele abstained frorn comrnent
this proposal. Diana felt that if the applicant took into
account that this was a tourist town, there could possibly
re landscaping. Peter Jamar replied that he felt they
rk with the CDoH on the increase landscaping.
moved and Sid seconded to recommend approval of ted SDD to
tion that
the Town Council per the staff rnemo with the
be Ia caped.
if possible, the 7 parking spaces
The conditions from the staff rnern
1. Th
co
development erted to any
contained
form of
the date
within SDD L4 time share own
allowed to
were!
not be for a period
issuance.
Any
per
ts the the Vail
ot2 years frorn of building
The ap licant agrees to lirnit the of any new dwelling units a roved to this developnent lan to those restrict ons outl-ined in Section .26.O75A Condominium of the Vail Municipa Code.Conversio
Notwithst in Section l-VaiI shall no period during is al-so a owner
2. The 92 additional
approval of SDD14 transient residen
3. The appli
and const
ng the foregoi / the restrictions set forth
26.O75 of the icipal Code at the Town of
apply to
frich they
dwelling units during any rea owned by any individual who letree Hotel .
odation units approved with the 1l be developed as lodge rooms or
I units under a single ownership.proposal to cond umize the accornmodation units or transient resi units would require approval as the subdivisi regiula ions of the Town of Vail.
all costs related to the design
ion of the eration lane irnprovements
required or the Doubletre access pernit. as subrnitted to . These irnprovements shall be the Sta Highway Departnen
conpletpd prior to the issua ce of a Temporary Certificate
ofO this ncy for any new resi ential units developed on
4. Pri r to the issuance of a build\ng permit, the applicant
approvals from the to access off of the
1l demonstrate that all requir te Highway Departnent for chang
uth Frontage Road have been obtai
5.Prior to the issuance of a building t for the the owner, or construction of any improvernent in SDD1
owners of SDD L4 shall provide to the of Vail
documentation of the agreement between th Vail VaIIey
Medical Center and Vail Holdings, Ltd. that Iows the
Doubletree Hotel its designated employees or
right to use a rninimum of 48 parking spaces
sMll
hip
Valley Medical Center structure fron the hours f 5:30 PM
*.r
Parn fett that with so many constraints on the site, the 250 ordinance did not take that into consideration. She had no problem with the setback requests. Chuck asked about the zoning and if the deck could go further into the setback. He
was told it was primary/secondary and the deck could go further into the setback area.
Jim asked Peter about the 250 square foot ordinance, and Peter stated that it was a matter of interpretation. Jim agreed with Peter. Diana asked about floodplain infonnation. Peter stated that they would have to go through a process to nodify the floodplain. Chuck asked if aspens that large could be
moved, and was told probably not.
Pam moved and Sid seconded to approve the request, citing exceptional and extra circumstances, with the condition that a deed restriction be placed on the propertv statinq that no structures be built east of the creek. The vote lras 4 in
na1 .
75 south |rontage roed
YEil, coloredo 81657
(303) 476-7000 ofllce of communlty developmenl
PUBLTC NOTICE
NOTfCE rS HEREBY GIVEN that the Vail Town Council will hold a public hearing on Tuesday, March 7, 1989 in the Town Council
Chambers at 7130 PM.
Items for review include:
1. A request for a conditional use permit in order to construct an addition and a parking structure to the Vail Valley Medical Center on Lot F, vail Village 2nd Filing at
L81 West Meadorir Drive.Applicant: Vait Valley Medical Center
2. A request for a stream setback and front setback variances for Lot 10, B).ock t, VaiI Village First Fi1ing.Applicant: PhiI Hoversten
If you have questions concerning Item #1, please feel free to call Kristan Pritz at 479-2138. It you wish to know more about Item 2, please feel free to contact Mike Mollica at 479-
2138 .
TO:
FROM:
DATE:
SUBJECT:
Planning and Environmental Commission
Coumunity Development Department
February 27, 1989
A request for variances frorn reguirement and from the 3O,to allow for the construction
the 20' front setback strean setback requirement,of a prirnary/secondary
I.DESCRIPTION OF VARIANCES REQUESTED
Tle applicants are the owners of lot lO, BLook l, Vail Village FirFt Filing, which is located at 342 MilI Creek Circle. The property has an existing single farnily residence located upon it, with a building footprint of l_O4O square feet. The owner is proposing to demolish and remove the existing structure, and to construct a new primary/secondary residence with a footprint size of 2,LLL square feet.
The proposed building would require the following variances:
L) Front Setback - The reguest is to allow an encroachment of l-4 feet into the required 20 foot setback.
2) Stream setback - The request is to allotr an encroachrnent of 8 feet into the required 30 foot setback (measured from the center of the stream).
residence.Applicant: Robert and Francis*-Gunn
and Findings, Section L8.6l-.060 of
Department of Conmunity Development the requested variance based upon the
It should be noted that the existing residence on this lot currently encroaches l,0r-5rr into the front setback.
II. ZONING CONSIDERATIONS
Zone District: Prirnary/Secondary Residential Lot Size: 0.4052 acres/L7,651 sguare feet
Maximum GRFA: 4Ol-5 sg ft (+25O sfr ord #36/L9BB : 4265 sf)Proposed GRFA: 41_88 sg ft
rTT. CRITERIA AND FINDINGS
Upon review of Criteria the nunicipal code, the
recommends approval of following factors:
A.
Consideration of Factors:
The rel onshi of the r ested variance to othe stin aI uses and structures vicinitv.
Front Setback Variance
Residences along the interior of MiII Creek Circle have historicatly been located in close proxinity to their front property lines which are nearest the road. Many of the existing homes in this area encroach into their respective front setbacks and a few structures are even located across property lines. The effect of maintaining these structures on the outer edge of the Circle is the creation of a large rropen spacerr area on the interior of the Circle. This rtopen spacerr area is utilized as a view corridor toward the Gore Range by
some of the property owners.
The Department of Comnunity Development believes that the requested front setback variance would not adversely affect the privacy of use of any adjacent properties.
The majority of the existing trees along Mil1 Creek Circle wiII be naintained in their present location and a few will be slightly relocated, thereby preserving the strong landscape buffer along the south property fine.Allowance of a front setback encroachrnent on this site would also ensure the preservation of the rnature evergreen and aspen trees located inmediately north of the existing residence.
Stream Setback Variance
The Department of Conmunity Development agrees that this site exhibits some very difficult development restrictions, given the location of Mill Creek as it bisects the Iot. The encroachment into the 30 foot
stream setback has been reviewed closely by the staff,and it is our opinion that the proposed encroachment,which wilt rnaintain a distance of L2 feet from the loo
- year floodplain, rrould still allow for the developnent of a healthy stream tract. The applicant tras agreed to
complete extensive landscape inprovernents along both
stream banks throughout the length of this lot.