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Last modified
1/29/2010 10:11:51 AM
Creation date
10/4/2006 11:24:41 PM
Metadata
Fields
Template:
Floodplain Documents
County
Denver
Jefferson
Community
Denver, Lakewood
Stream Name
Weir Gulch Tributaries; 1st Ave to Dakota Ave.
Basin
South Platte
Title
Flood Hazard Area Delineation
Date
7/1/1977
Prepared For
Denver / Lakewood
Prepared By
UDFCD
Contract/PO #
&&
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />6 <br /> <br />FLOOD HAZARDS <br /> <br />FLOOD PLAIN AND FLOODWAY DATA <br /> <br />The flood hazard area delineation maps show the outline of the 100-year flood <br />event for fully developed basin conditions and present channel conditions. <br /> <br />1st Avenue Tributary: An undersized channel upstream of the tributary's con- <br />fluence with Weir Gulch at Stuart Street is causing flooding even at high <br />frequency storms, Lack of maintenance of the existing channel in all reaches <br />is causing debris to reduce the available cross-section at culvert inlets <br />sometimes by as much as 50 percent. Considerable hazards are associated with <br />the flooding condition at Sheridan Boulevard just north of 1st Avenue, During <br />the 100-year flood, the water may pond as deep as four: feet and cause prob- <br />lems because of Sheridan Boulevard's function as a major north-south traffic <br />arterial, West of Sheridan Boulevard, a 24-inch corrugated metal culvert is <br />the only conduit conveying runoff toward Sheridan Boulevard, causing ponding <br />and subsequent overflow into Sheridan Boulevard, Flood hazards are less severe <br />west of Harlan Street. <br /> <br />The maps are supplemented by Tables 4 and 5, "Flood Plain and F100dway <br /> <br /> <br />Reference Data". The tables contain a listing of potential 100-year flood <br /> <br /> <br />discharges, elevation of thalweg, elevation of flooding, width of flooding, <br /> <br /> <br />and velocity of flow for all cross-sections utilized along each tributary, The <br /> <br /> <br />floodway data presented shows the elevation of flooding, floodway width and <br /> <br /> <br />velocity of flow based on the most restrictive of the following requirements: <br /> <br /> <br />1, An increase in water surface elevation of ,5 feet; <br /> <br />2. A mean velocity in the floodway of 4 feet per second; <br /> <br /> <br />3. A total depth in the floodway of 2 feet. <br /> <br />SUMMARY <br /> <br />Dakota Avenue Tributary: At Sheridan Boulevard and immediately east, the <br />main problems to be anticipated are high velocity flows overtopping Sheridan <br />Boulevard at a depth exceeding one foot, and velocities of flow in Alaska <br />Avenue reaching ten feet per second. Traffic congestion and hazard to life <br />appear a real possibility. Between Sheridan Boulevard and Harlan Street, the <br />hazards due to flooding are primarily limited to temporary loss of access to <br />residences on Depew and Eaton Street. The area could be subject to considerable <br />erosion. Between Harlan and Pierce Streets, major problems can be anticipated <br />during a 100-year flood because of ponding. Pierce Street is used quite fre- <br />quently as access to the residential area north of Villa Italia Shopping <br />Center, The residences located south of Alameda Avenue and east of Pierce <br />Street are valued fairly high, Flooding of the magnitude expected during a <br />100-year event could cause considerable damage because of the long time it <br />may take the water to recede due to extremely flat slopes, <br /> <br />The probable limits of flooding due to a 100-year storm occurring over the <br />fully developed drainage basin but with presently existing channels have been <br />identified in this report, <br /> <br />The State of Colorado and the Urban Drainage and Flood Control District <br /> <br /> <br />designate the 100-year floodflow under fully developed basin conditions as <br /> <br /> <br />the basis for regulatory purposes. The lOO-year flood plain limits and water <br /> <br /> <br />surface profiles are shown on the Flood Hazard Area Delineation Maps. <br />
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