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FLOOD10469
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FLOOD10469
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Last modified
1/26/2010 10:12:58 AM
Creation date
10/11/2007 11:59:06 AM
Metadata
Fields
Template:
Floodplain Documents
County
Boulder
Community
Boulder
Stream Name
Fourmile Canyon Creek, Wonderland Creek
Basin
South Platte
Title
Request for LOMR - Boulder
Floodplain - Doc Type
Correspondence
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<br /> <br />Table 10. Percent Blockage Within Wonderland Creek Crossings in the LOMR <br /> <br />Crossing Percent Type <br /> B1ocka2e <br />Broadway St. 0% 14- x 8-ft RCB <br />Riverside 0% 5-ft RCP <br />15th Street 0% 2 x 8- x 6-ft RCB <br />19th Street 100% 36-in RCP <br />Folsom A ve./26th Street 0% 2x7-x4-ftRCB <br />Winding Trail Dr. 0% 3 x 11- x 4- ft RCB <br />28th Street 0% 10- x 6-ft RCB <br />Kalmia Ave. 0% 2 x 11- x 6-ft & <br />14- x 6-ft RCB <br />Fire Access 50% 2x11-x3.5-ft& <br />14- x 3.5-ft RCB <br />Diagonal/State Highway 100% 36- x 57-in CMPA <br />119 <br />Parking Access Bridge 0% Bridge <br />34th Street 0% 2 x 9- x 4-ft & <br />12- x 4-ft RCB <br />Spring Ck. Place 0% 2xll-x5-ft& <br />14- x 5-ft RCB <br />Foothills Pkwy/4th 0% 3 x 18.4- x 5-ft <br />RCB <br /> 4 x 8.5- x 4-ft, <br />Kings Rd. Blvd. 0% 2 x 2- x 13.5-ft, <br /> & 16.7- x 4-ft RCB <br />Valmont Rd. 0% 18- x 7.5-ft RCB <br /> <br />The m~thod used to model crossings in HEC-RAS was selected based on a thorough <br />analysis of the data produced under different modeling methods available in HEC-RAS <br />and engineering judgment. All but one crossing is a culvert, and the culverts were <br />modeled with the culvert option in HEC-RAS. <br /> <br />Small pedestrian path crossings over the channel were assumed to be obstructions <br />without conveyance below the crossings. These crossings were usually hard coded into <br />the HEC-RAS model, which can result in an inverse slope for a short distance in the <br />profile. <br /> <br />-24- <br /> <br />-.--~. .-". ~-._._- <br />
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