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Home My WebLink AboutDRB120153Department of Community Development 75 South Frontage Road Vail, CO 81657 Tel: 970-479-2128 www.vailgov.com Development Review Coordinator Application for Design Review New Construction General Information: This application is for all new construction. Applicable Vail Town Code sections can be found at www.vailgov.com under Vail Information – Town Code Online. All projects requiring design review must receive approv- al prior to submitting a building permit application. An application for Design Review cannot be accepted until all re- quired information is received by the Community Development Department, as outlined in the submittal requirements. The project may also need to be reviewed by the Town Council and/or the Planning and Environmental Commission. Design review approval expires one year from the date of approval, unless a building permit is issued and construction commences. Fee: $650 ______ Single Family ______ Duplex ______ Multi-Family ________Commercial Description of the Request: ____________________________________________________________ ___________________________________________________________________________________ Physical Address: ____________________________________________________________________ Parcel Number: ___________________________(Contact Eagle Co. Assessor at 970-328-8640 for parcel no.) Property Owner: ____________________________________________________________________ Mailing Address: ____________________________________________________________________ ___________________________________________ Phone: _________________________________ Owner’s Signature: __________________________________________________________________ Primary Contact/ Owner Representative: _________________________________________________ Mailing Address: ____________________________________________________________________ ___________________________________________ Phone: _________________________________ E-Mail: _______________________________ Fax: _________________________________________ For Office Use Only: Cash___ CC: Visa / MC Last 4 CC # _________ Exp. Date: ________ Auth # _________ Check # ___________ Fee Paid: __________________________________ Received From: ___________________________________ Meeting Date: ______________________________ DRB No.: ________________________________________ Planner: ___________________________________ Project No: _______________________________________ Zoning: ____________________________________ Land Use: ________________________________________ Location of the Proposal: Lot:________ Block:________ Subdivision:_______________________________________ Flood Repairs to Booth Creek, near Vail Mtn School. 2965 Booth Falls Road, Tract B 2101-034-01-001 Town of Vail 75 S. Frontage Rd, Vail, CO 81657 970-479-2235 Tom Kassmel 1309 Elkhorn Drive, Vail, CO 81657 970-479-2235 tkassmel@vailgov.com 970-479-2166 By David Rhoades at 4:36 pm, May 09, 2012 WAIVED xxxxxxxxxxxxxxxx Minor Exterior Alteration xxxx Waived DRB120153 PRJ12-0229 VAIL VILLAGE FILING 131Tract B Property Address Parcel # Legal DescripƟon Development Site Area sq Ō acres buildable sq Ō Zone District / SDD # Hazard Zones SecƟons 12‐21 & 14‐7 Snow Avalanche High Severity Moderate Severity N/A Debris Flow High Flow Moderate Flow High Avalanche N/A Rock fall High Severity Medium Severity N/A Excessive Slopes ≥30% N/A Floodplain 100 year ﬂoodplain Floodway Wetlands N/A Creeks, Streams SecƟon 12‐14‐17 Gore Creek on site adjacent to site N/A Other tributary: ______________ on site adjacent to site N/A Project DescripƟon Development Standards Allowed ExisƟng Proposed Gross ResidenƟal Floor Area (maximum) Chapter 12‐15 Primary sq Ō Secondary sq Ō EHU sq Ō TOTAL sq Ō 250 AddiƟon Interior Conversion Credits: Setbacks (minimum) SecƟon 14‐10‐4 Front Ō Side Ō Side Ō Rear Ō Watercourse Ō Site Coverage (maximum) see deﬁniƟon SecƟon 12‐2‐2 Building Height (maximum) see deﬁniƟon SecƟon 12‐2‐2 Sloping Ō Flat Ō Landscaping See deﬁniƟon SecƟon 14‐2‐1 SecƟon 14‐10‐8 SoŌscape sq Ō Hardscape sq Ō TOTAL sq Ō Driveway SecƟons 14‐3‐1 & 14‐3‐2 Max Curb‐cuts Max Grade @ cen‐ terline Min Width Heated drive? Yes No Yes No Snow Storage % Parking SecƟons 12‐10 & 14‐5 #Enclosed Spaces #Unenclosed TOTAL Outdoor LighƟng (maximum) SecƟon 14‐10‐7 # ﬁxtures Property Information Project Information 2965 Booth Falls Road, Tract B 2101-034-01-001 Tract B 4 Booth Creek 4 Flood Repairs to Booth Creek, near Vail Mtn School. PO Box 2123 Glenwood Springs, CO 81601 (970) 947-9568 December 16, 2011 Thomas Kassmel, PE Town of Vail Department of Public Works Town Engineer 1309 Elkhorn Drive Vail, CO 81632 Phone 970-479-2235 RE: Booth Creek Alternatives Assessment Dear Thomas, RiverRestoration has investigated alternative designs to address sediment transport and flooding issues on Booth Creek within the Town of Vail (TOV). Booth Creek experienced a near 500 year flood event of 472 cfs on June 6th, 2010. During this event lateral and vertical channel erosion occurred in reaches of Booth Creek, upstream of the bike path bridge, resulting in significant sediment deposits. These deposits are evident for approximately 250 ft upstream of the bike path bridge and downstream to the grade control at the I-70 culvert inlet. Within this reach, aggradation has reduced the hydraulic capacity of the channel and increased active bank erosion, subsequently exacerbating the potential for overbank flooding. Booth Creek sits on an alluvial fan in its lower reaches and as a result is perched up gradient from many TOV facilities. During spring flooding in 2010 overbank flows ran through the tennis courts of Booth Creek Park, southwest across the bike path and into the frontage road drainage ditch. From there, the flows were routed through an 18” cmp under Bald Mountain Rd. which lacked sufficient capacity to convey the flow in its entirety. A secondary limitation on Booth Creek flood conveyance capacity is at the I-70 culvert crossing. As shown by hydraulic analysis, the existing 6 ft diameter CMP is undersized and incapable of passing the 100 year flood event. RiverRestoration performed detailed survey of Booth Creek on September 1st, 2011 from approximately 175 feet above the bike path bridge to the inlet at I-70. This survey was used to create an Existing Conditions model of the site, to comply with the Effective FEMA regulatory hydraulic model. Additional field work was also performed to estimate the stream bed particle size gradation of the reach. Flow data from the USGS Booth Creek (USGS # 09066200) stream gage were also obtained and used to describe the channels hydrology. A comparison of the Effective and the Existing Conditions model geometries shows evidence of aggradation on Booth Creek, upstream of the bike path bridge. As a result, Existing Conditions predicted 100 year water surface elevations exceed published FEMA PO Box 2123 Glenwood Springs, CO 81601 (970) 947-9568 Regulatory Base Flood Elevations (BFE) in this reach. Concept alternatives were evaluated by RiverRestoration to reduce the overbank flooding risks and improve sediment transport rates, compared with the current channel configuration. RiverRestoration looked into four different alternatives to address the issue of aggradation and loss of hydraulic and sediment transport capacity. These alternatives are listed below: 1. Remove the existing bike path bridge and replace it with a modified configuration to enhance sediment transport at the site; 2. Modify the channel grade from the I-70 culvert upstream approximately 350 ft to improve the floodwater and sediment transport capacity of the reach; 3. Construct a cribwall along the right bank, upstream approximately 175 ft from the bike path bridge to further enhance the sediment transport and protect existing facilities from overbank flooding; and 4. Retrofit trash racks onto the face of the bike path bridge to collect floating debris. The following paragraphs discuss each of these alternatives. Alternative 1 Replace Bike Path Crossing Modifications evaluated for the existing bike path bridge included replacing it in kind with a steeper structure to improve sediment transport, reducing the width of the bridge openings to increase velocities and widening the structure to reduce backwater effects and reduce localized flooding. The bike path bridge was originally assumed to be a double box culvert. However, no fixed floor was identified during work performed at the bridge in 2010. Following sediment transport analyses of the bridge, it was determined that the benefit derived from replacing the culvert could also be achieved by modifying the bed elevations at the inlet and outlet of the existing bridge without incurring the expense of replacement. In addition, alterations to the geometry of the bridge openings resulted in impacts to the BFE and would entail additional work to ensure compliance with federal floodplain requirements. Based on the hydraulic performance of the bridge, this alternative is not recommended by RiverRestoration. Alternative 2 Improve Flood Capacity Significant sediment deposits were observed throughout the project reach primarily extending from the inlet of the bike path bridge upstream approximately 250 ft. Two manmade grade control structures were also observed in the lower half of the reach at the USGS stream gauging station and approximately 25 ft upstream of the I-70 culvert inlet. To reduce flood hazards within the project reach, grading of the channel is proposed. Removal of the sediment deposits and manmade grade control structures coupled with re- grading of the channel will temporarily improve sediment transport rates within the project reach, most notably through the bike path bridge. Corresponding reductions in bed elevations will lower predicted 100 year flood elevations below publish BFE thereby PO Box 2123 Glenwood Springs, CO 81601 (970) 947-9568 reducing associated overbank flooding risks. However, without structural modifications to the channel banks, sediment deposits are anticipated to recur and require periodic maintenance. Extension of the existing right channel berm downstream of the bike path bridge to the fill slope for the frontage road is also recommended as part of this alternative. Currently the existing berm tapers off approximately 45 ft short of the frontage road fill slope allowing flood waters backwatered by the I-70 culvert to flow west along the edge of the frontage road towards the Bald Mountain Underpass. Hydraulic analysis shows overbanking of the existing berm occurring at flows less than the 10 year flood event. Without berming at this site continued flooding immediately upstream of the I-70 culvert will likely persist. Alternative 3 Improve Upstream Sediment Transport In an attempt to reduce periodic grading of the channel, it is recommended to make structural changes to the upstream channel, to improve sediment transport within the reach. This alternative consists of constructing a cribwall along the right bank from the bike path bridge upstream approximately 175 ft. Benefits of a cribwall in this reach include increased sediment transport rates, bank stabilization, decreased channel width to depth ratios, enhanced aquatic habitat, and reduced overbank flooding potential. Construction of a cribwall would increase sediment transport within the reach by narrowing the effective channel width during lower probability flood events and focusing the thalweg along its toe. Bank stabilization activities associated with the cribwall construction will also help to reduce sediments supplied onsite from ongoing bank erosion. Reductions to the existing channels width to depth ratio will also benefit fisbh holding and passage by narrowing channel during the low flow season. Additionally, willow staking along the cribwall face should also be performed to enhance the stability of the structure and provide cover for aquatic species. A secondary benefit of constructing a cribwall along this reach is to provide housing for sediments removed from the creek during channel grading activities. Construction of a cribwall will help to minimize hauloff associated with Alternative 2. Limiting overbank flooding within this reach would help to reduce future damages to TOV facilities. Extending the existing right channel berm downstream of the bike path bridge to the fill slope for the frontage road is also recommended as part of this alternative. Alternative 4 Improve Flood Fighting and Maintenance Acess The addition of two trash racks onto the face of the bike path bridge will aid in the collection of woody and other floating debris upstream of the bridge openings to prevent future blockages similar to the one observed following flooding in 2010. The proposed PO Box 2123 Glenwood Springs, CO 81601 design of the structures is to allow for annual flood events. To prevent blockages of sediments, the spacing of the steel bars should be set to the measured d should be cut back to approximately configuration of the design. A concept plan (C-1) has been included with this report to show three alternatives are recommended to increase sediment transpor reduce overbank flooding potential, stabilize active bank erosion, enhance degraded aquatic habitat, and collect floating debris upstream of the bike path bridge. Ideally Alternatives 2, 3 and 4 implemented independently if desired by the TOV. Alternatives 2 and 3 to be greater than and easement issues, including temporary staging and access. DR if required, will also be the responsibility of TOV. We await your selection of alternatives for Booth Creek and will continue to work under the above assumptions. Please let us know if there are additions or clarifications necessary. Sincerely, Jason Carey P.E. River Engineer jason.carey@riverrestoration.org (970) 947-9568 PO Box 2123 Glenwood Springs, CO 81601 (970) 947-9568 is to allow for ease of cleaning following or as necessary during annual flood events. To prevent blockages of sediments, the spacing of the steel bars should be set to the measured d90 of the reach. In addition, the bike path bridge deck ck to approximately 12 ft and fitted with a new headwall to allow for the 1) has been included with this report to show Alternatives 2 three alternatives are recommended to increase sediment transport rates within the reach, reduce overbank flooding potential, stabilize active bank erosion, enhance degraded aquatic habitat, and collect floating debris upstream of the bike path bridge. 2, 3 and 4 will be enacted simultaneously however; they can be implemented independently if desired by the TOV. We anticipate the relative costs of to be greater than Alternative 4. TOV will be responsible for lands and easement issues, including temporary staging and access. DRB and PEC submittals, if required, will also be the responsibility of TOV. We await your selection of alternatives for Booth Creek and will continue to work under the above assumptions. Please let us know if there are additions or clarifications jason.carey@riverrestoration.org cleaning following or as necessary during annual flood events. To prevent blockages of sediments, the spacing of the steel bars In addition, the bike path bridge deck to allow for the Alternatives 2-4. These t rates within the reach, reduce overbank flooding potential, stabilize active bank erosion, enhance degraded ever; they can be We anticipate the relative costs of . TOV will be responsible for lands B and PEC submittals, We await your selection of alternatives for Booth Creek and will continue to work under the above assumptions. Please let us know if there are additions or clarifications TOWN OF VAIL BOOTH CREEK C-1 P.O. Box 2123 Glenwood Springs, CO 81602 www.RiverRestoration.org BIGHORN 12-15-2011 1" = 20' DRAFT-NOT FOR CONSTRUCTION TO W N O F V A I L BO O T H C R E E K B I K E P A T H B R I D G E DR A F T D E S I G N PL A N V I E W Example of Log Cribbing @ Aspen Ct Bridge 2011 Booth Creek Cobble Debris