HomeMy WebLinkAboutB04-0193 PRELIMINARY DRAINAGE REPORT JULY 2004f\o<rrS
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PRELMINARY
DRAINAGE REPORT
GORN CREEK RESIDENCES
VAIL, COLORADO
Julv 2004
RECEI\,|ED
,,.':,0 i .
Town o! \l6ilI gov- o(t3 0FF*il'* *#PY
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PRELIMINARY
DRAINAGE REPORT
GORE CREEK RESIDENCES
VAIL, COLORADO
July 2004
- Prepared for: Vail Resorts Development CompanyI 1"""":H11''
I Prepared by: Alpine Engineering, Inc.r hl.?i13" ,,u,,
(s7o)s26-3373
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I TABLEOFCONTENTS
I. Vicinity Map
I il. Introduction.. ........---.....1
r III. Drainage Basins ........'.'1
t IV. Peak Flow Determination ...'.'.'..-'..'...2
I V. Detention and Pollution Control......... .........'...----.-.-2
I VL Floodplain.... '.........'.'.'.2
I VII. Summary...... .....'..........3
I VIII. Appendices:
Appendix A - Storm Drainage Calculations
t IX. Maps:
Sheet I - On-Site Drainage Area Map
Sheet 2 - Off-Site Drainage Area Map
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I luly 2004 Gore Creek Residences Drainage i
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VICINITY MAP
(.Y.:l
16i",,;S'
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II. Introduction
Gore Creek Place, also known as the West Day Lot, is located in the southeast
corner ofthe intersection ofForest Road and the South Frontage Road, north ofGore
Creek and south and west of the Maniott Hotel in the Lionshead section of Vail,
Colorado. Proposed for the site are eight duplex units. The site will be accessed from
Forest Road and the driveway to the units will be via a tunnel which accesses the
underground garages.
III. Drainage Basins
Off-site and on-site drainage comes from the existing Maniott Hotel, the
Mariott parking structure and the Maniott surface parking lot. The existing Marriott
parking lot is slated to become hotel but runoffnumbers for the parking lot should be
similar to the future hotel. There is also some off-site drainage from the Vail Spa that is
carried through the site by storm sewer pipes and inlets t}rat are located in West
Lionshead Circle.
The off-site drainage will be piped past the proposed lots by 12" PVC pipes for
the smaller areas, a 24" RCP for the area coming from the Vail Spa and Maniott Parking
Structure and an 18" RCP for the area from the future hotel/existing parking lot. The 12"
PVC pipes will be comected to inlets adjacent to the proposed units through the tunnel
and the pipe connection through the tunnel will be designed by the mechanical engineer.
The connections from the inlets to the manholes are not shown on these plans. The
manholes will also serve as outlets for the subdrains from the proposed buildings.
July 2004 Gore Creek Residences Drainage
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ry. Peak Flow Determination
Peak flows have been calculated using the Rational Method because drainage
areas are small. Runoffcoefficients were taken from the Denver Urban Drainage and
Flood Control District, Drainage Criteria Manual, Table 3-1 for the appropriate land
surface characteristics. The Rainfall Intensity-Duration Curve for Vail, Colorado was
used for rainfall intensities in the Rational Method calculations. Time of concentration
was estimated to be 10 minutes for the larger areas and 5 minutes for the smaller areas.
Calculations may be found in Appendix A.
V. Detention and Pollution Control
Detention is not recommended for the site because developed flows will not
change significantly from existing flows.
Pollution control is being provided by a sand/oil separator for the tunnel which is
where the majority of the pollutants will originate
VI. Floodplain
The proposed development will be outside and above the 100 year floodplain and
will not impact the water surface of the 100 year floodplain. The floodplain was
interpolated from FEMA maps by Peak Land Consultants and is shown on the drainage
area maps,
July 2004 Gore Creek Residences Drainase
VII. Summary
Storm sewer pipes have been sized to include the proposed development, the
existing off-site areas and the future off-site development. lnlet capacity and culvert
outlet protection calculations will be provided in subsequent drainage reports.
July 2004 Gore Creek Residences Drainage
Appendix A
Storm Drain Calculations
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DRAINAGE CRITERIA I'IANUAL
TAELE 3-1 (42)
RECOIiMENDED.RUNOFF COEFFICIENTS AND PERCENT II'IPERVIOUS
RUNOFF
LAND UsE qR
SURFACE CHARACTERISTICS
PERCENT
IMPERVIOUS 2
FREQUTNCY
5 100
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Bus i ness:
Commercia'l Areas
' Neighborhood Areas
Residential:
Single-Fami ly
Multi-Unit (detached)
Mul ti-Uni t (attached)
I/2 Acre Lot or Larger
Apartments
Industrial:
Light Areas
Heavy Acres
Parks, Cemetaries:
Playgrounds:
School s:
Railroad Yard Areas
70
80
90
7
1J
50
20
95
70
50
70
*
90
0
0
.87
.50
.40
.45
.60
.30
.65,
.87
.55
.45
.50
.65
.35
.70
.72
.80
.18
.20
.50
.25
.88
.70
.50
.ou
-tu
.40
.70
.76
.85 .
.25
. JU
.60
.35
.80
.60
,70
.80
.60
.80
.82
.90
.45
.3U
.45
.7r
.80
.10l.._15
.45
.20
Undeveloped Areas:
Historic Flow Analysis- 2
Greenbe'l ts, Agricul tural
0ffsite Flow Analysis 45
(when land use not defined)
Streets:
Paved
Gravel (Packed)
Drive and llalks:
Roofs:
(See "Lawns")
.43 .47 .55 .65
IUU
40
96
.o!
.40
.87
.80
.00
.05
.88
.45
.87
.85
.90
.50
.88
.90
.05
.25
.60
.89
on
.20.01
.15
llOTE: These Rationa'l Formu'l a coefficients may
*See Figure 2-l for percent impervious
ll-l-90
lloDA:r nDi lr.rtac trtn ct nna an^rTnnr ntc.r-Dr.-r
not be valid for large basinsl"
Lavrns, Sandy Soil
Lawns , Clayey Soi I
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/NTENS/TY - DURATION.
FREQUENCY CURVES
n304050
( TIME MINUTES)
VAIL ,COLORADO
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- ALPINE ENGINEERING, INC. PAGF OF PAGES
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circular chauel Analy6ia & DeaLgn
solved lrith Manningra Bquaclo!
open Channel - unltorD f,Iov
Porkaheet Nane:
Comfient: Lion€head Gole Creek Place-Basln fl
Solwe Fo! Fu1l Flow Slopr
civen Input Data:
Dlaneler,. 1.00 ft
manning'a n....,.. 0.01,0
Di€qharge. . . . . . . . . a.08 cfs
Coirputed Reaulta !
l\rl l Flo* Channel stope
FulI FloP DepEh. ., ,.. ..
veloclty,.
FIou A!ea.........
CliCical Depth. . . .
Critical Slope, . . .
Percent PuLl.,....
ltull Capaclgy.....
QHAX e.94D.,......
Froude Numbar.....
0.00?8 ft/f,t
5.19 lp6
0.?9 af
0.85 lr
0.0073 frlfr
100.00 t
4 ,08 cf6
4.39 cf s
FUITIJ
Open Channel Flor Uodule, Ve.aion 3.11 (c) 1991
Hae€tad Uethod8, Inc. t 37 Brook8ide Rd t waterbuly, cr 06708
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circular channel Analysia & D€Eign
Solved t{ith Manning's Bquatlon
Open Channel - Unlforn flor
workgheeE Name I
I Comment: t lon8head Gore cieek Place-Ba6in fl2
I solve For Full rloe slope
r ciwen rnput Data:
DL.meter. 1.00 tt
I Manningra n...,... o. olo
I Dischalge. . . . . . . . . 1.37 cfs
I conputed ReaullE I
I Full Floir channel slope 0.0009 fElft
Full FIor Depth........ 1.00 ft
l lill'iil :: : ::i:1"
I crltical Depch.... o.5o ft
Crllical SloPe.... 0.0036 tlltt
I Percent FuII.... -. 1oo.oo t
I FulI capaclty...., 1.37 cls
QHA:X O.9!D..".'.. 1.47 cf,s
I Proude Number... .. FUIJIJ
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- open channel Flon Moaule. veraion 3.41 (c) 1991
llaestad Methods, Inc. r 37 Brook6lde Rd r rat€rbury, cl 06708
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cilcula! channel AnalyBis & Dealgn
Solved nith Manningts Equatlon
open channel - Uniform flo,
llorkalreet Name :
Comment: Lionshead Gore Creek Place-Basin f3
Solve For Ful,l Flotr Slope
Given tnput Data:
Dian.tcr. . . . . . . , . . 1.00 lt
Manning's n.,...., 0.010
Dl,6cha!ge, 0.91 cfs
Corqruteal Reaults:
!'ull Plon chaunet slope
Pull Plo, Depth...... ..
Velocity,.... .....
Flox Area.
C!ltlcal Depth. . . .
Critical Slgpe. . . .
Percenl FuII......
Full capacity. . -..
QrrAx o.94D.....-..
Froude Number.....
0.000{ ftlft
r .00 ft
1.15 fpa
o,79 af
0.,10 fl
0.0034 f 1,,,f I
100.00 t
0,91 cf6
0.98 cfs
FULIJ
Opcn Channcl PLor Uodule, Veralon 3.{1 (c) 1991
Haeatad [etbodg, Inc. r 37 Brookaide Rd . tlalerbury, Ct 06708
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cllcu1ar channel Analyala & Dealgn
solved eilh l{anningrE Bquation
Open Channel - uniform flor,
llolksheet Name I
I commen! | tion8head oore cr6ek Prace-gas.ln t4,12 & 13
I
solve Fo! FuLl Flow slope
civen Input Data:
I llilill; ;:: :: ill,"
- Dlscharg€. 23.40 ctg
t **il:i;:::';:"".,
".""" o.o1o7 ,r,*
Full Flos Depch........ 2.00 ft
I lill'il:;::::::: lii j?"
critlcal Depth... . L,12 tEI illllli'iiiil :: ,.|:ll'i ""'
I Furr capaci.ry..... 23.40 cls
oMAX O,94D........ 25.17 cfs
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Froude Number..... FuLL
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Open Channel Floe Itodule, Version 3.41 (c) 1991
r Haestad !,lethods, Inc- a 3? Brookside Rd r Watetbury, Ct 05708
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Circulat channel Analysls & f,iesign
Solved $ith Manningr s Equation
Opcn Channel - Unifolm fLolt
Work6heel Name:
I Cooment: Lionahead Gole Creek PLaco-Basl'n ll5
f Solve For Full FloU sloPe
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Given Input Da!a:
Dianeter.. 1,00 lt
I l{anningra n....... o'o1o
I Disqharge. 1. 01 cfg
I computeil Reeulla:
I FulI Flou channel Slope 0.0005 lllfE
Full Flot Deplh.....,.. 1.00 ftI fll'ill : : :: l li i?"
- crlrlcal Depth. . . . 0.42 ft
Clitical Slope.... 0.0034 ftllt
I Percent. FulI...... 1oo.oo t
t E!11 capaclty..... 1.01 cfs
oN'AX O.91D......., 1,09 cfE
I Flouile lfunber..... FUI,L
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Open Channal Flor l,lodule, Ver6ion 3-,ll (c) 1991
Ilaestad ltethods, Inc. i 37 Brook6lde Rd . walerbury' ct 0670s
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cilcular channel Analy6ls & Design
Solved silb [annlngrs Bquallon
open Cbannel - Uliform floi'
tlorksheel Name:
I co6ment: t ionshead Gole Creek Place-Basin 16
I
6olve Fo! PuIl Flow sloPe
Given Input Data:
I :il::":;;:: :: : l:11."
I Diecharge,........ 4.26 cEa
I conputed Resulle:
I PuIl Flou Channel slope 0.0085 ft,/fc
E\rl1 Flou Depth,....... 1.00 ft
I velocicy. 5.42 EPa
I Flor Area.,....... 0.79 8f
crilical Depth'.., 0.87 ttr lllllll'"llill:: : ,,l:li'l ""'
I Futl capaclty..... 4.26 cfa
QMAX o.9{D'.. '.... 4.58 cfs
I Froude Numbe!..... FUITIJ
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Open Chatmel Plolr Moalule, ver6i.on 3.,11 (c) 199r
tlaestad Uethoda, Inc. r 37 Brook6lde nd r watetbury, Ct 06?08
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I cllcular cbannel Analyais & Design
Solved vith Manning,s Equalion
Open channel - Unifonn flowI
nollaheet Name:
I coftnent: Lion6heaat core creek Plaqe-Basi! St
solve Fo! FuIl Flou slope
I civen rnput Data t
Dl,aneter. 1.00 fc
I Hlill"l l:: : : i:ll'"."
I *T:ilill'l,l."".'
"'"n. o.ooo3 */rr
Full Flow Deplh........ 1.00 ft
I lill"ill. :: : : l:li li"
I crirlcal Deprh.... 0.38 fr
Crltical Slope.... 0.003{ ftlft
I fii"I"lrll;:: : "l.li 1,"
QMI|X O.9{D... ,.... O.87 cfa
Proude lfumber..... FULL
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I open channel Flos Module, version 3.{1 (c) 199:
llaestad l,lethode, Inc. r 37 Brookside Rd . naterbury, Ct 05708
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cilcular channel Analysis & De6ign
Solved with MannLng I E Bquation
open chaDnel - Unlforn flov,
worksheet Nane:I
I comment: t ioldhead Ggxe creek Plaqe-Basin t 8 & 10
civen Input Dala:
I ltilill:;;: :::: lli,"
r Dischalge. 3.88 cfs
I *T:::liil'Ii"",,., ,,"n. o.oor4 */rr
Full Flos Depth.. -..... 1.50 fl
I ;ill'ill.: : :: : ::::i'
critical Depbh,... o.?5 ftr l.ll.li'iiill: : ,.i:ll'l ""'
I Pull capacity..... 3.g8 cf'
QMAX O.94D....,. .. 4.17 cfa
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Froude Number..... FULtr
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open channel Flow Itodule, velEign 3.41 (c) 199r
g€eatad MethodF, Inc. r 37 Brookslde Rd r naterbury. Ct 06708
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solve For Full 81on srope
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cllcular channel Analy6i6 & Design
solved rith t{anning's BquatLon
op€n channel - Uniform llott
lforkaheet Nane r
t conment: LionEhead core creeh PLace-Baal,n f9
I Solve Por Full Flor Slope
I
Given fnpul Data I
Dlamete!, . , . . . . . . , 1.00 fl
I Mannilg,a n....... 0.010
I Dl8charge. . . . . . . . . o.5l cfa
I conputed Results !
I R.rll FIow channel slope 0.000r ftlft
Full Plor Deprh........ 1.00 ft
I veLoqity.. .,...... 0.65 fpg
I Flow Area..... .. .. o.19 af,
criticEl Depth.... 0.3 o ft
crltical slope.... 0.0033 f,t,if f t
I Pelcent Fulr...... roo.oo t
a Futl capaclry. ,... o.sl cfs
QtitA:x a.9{D. .... ... o.ss cts
f Froude Nurnber...., FULIJ
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Open Channel Flor{ Lodule, Versl.on 3,{1 (c) 1991
llaestad ethode, Inc. r 37 Brookalde Rd r wat.erbuly, Ct 05t08
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Circular channel AnalysiE & DeEign
Solved with ManniDg'6 Bquation
open channel - Uniforn flor
llolkaheet Name :
I comment: Llonshead Gore Cresk Place-Ba6ln [10
I solve For Pull Flor slope
I
clven Input Datsa:
Diameter.. 1.50 ft
I lfanttiugra n....... 0.013
I DigcharEe. . . . . . . . . 3.45 cfs
I couputed Re€ult6:
I Fu1l Plos channel slope o.ooLl ftlfl
Full Flor Depth...,.... 1.50 ft
I veloclty.. 1,95 fp8
I Flot{ A!ea. L.17 af
CllElcal Depth.... 0.71 flr :::::::'if: :: ,.l il'i ""'
I rtull capactty..... 3.45 cfE
Ol'tN( O.94D....'.'. 3.71 cfa
I Froude Nunbe!...., PULIr
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open channel Flor. Module. velsior J.{l (c} 1991
H.estad Methoda, Inc, r 3? Brooksl,de Ra r Watcrbury, Ct 06?08
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Clrcular channel AnalydiE & Deslgn
Solved ul.th Uanningr E Eguation
open channel - uniforn fLot
$olkaheet Name:
I co[went I t,ionshead core cre€k Ptace-BaBin *12 & x3
I solve For F\rl1 Flote slope
I
Given InPut Data r
DladeEer. 2. O0 ft
I lranning'a n....... 0.013
I Dlschatge. 21.10 cfd
I codputed Reaulta I
I Fult Flol' Channel slope o.oo€? ftlft
Full Flow Depth.. .. ,... 2.00 fl
I vrlocity. 6.72 fpa
I PIou Area......... 3.14 8f
Clltical Depth..., 1.65 f,tr lllllll'iiill:::: ,,l li'i ""'
I r!11 capaclty. . . . , 21 .10 cfs
Ql.tAx o.94D....,... 22.70 cfa
I Froude Nunibe!... ,. FULL
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open channel flor, Module, vergion 3.41 (c) 199!
Hae6taal l4cchods, Inc. . 37 Brookslde Ral r waterbury. cr 05?08
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MAPS