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<br />- <br />CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE <br />UNINCORPORATED AREAS OF ADAMS COUNTY, COLORADO, UNDER THE NATIONAL <br />FLOOD INSURANCE PROGRAM <br /> <br />On August 16, 1995, the Department of Homeland Security's Federal Emergency Management Agency <br />identified Special Flood Hazard Areas (SFHAs) in the unincorporated areas of Adams County, Colorado, <br />through issuance of a Flood Insurance Rate Map (FIRM). The Mitigation Division has determined that <br />modification of the elevations of the flood having a I-percent chance of being equaled or exceeded in any <br />given year (base flood) and to the regulatory floodway for certain locations in this community is <br />appropriate. The modified Base Flood Elevations (BFEs) and changes to the regulatory floodway revise <br />the FIRM for the community. <br /> <br />The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public <br />Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended <br />(Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C. <br />4001-4128, and 44 CFR Part 65. <br /> <br />A hydraulic analysis was performed to incorporate new hydrologic information and more detailed <br />topographic information along Comanche Creek from the Adams County boundary with Weld County to <br />just downstream of 26th Avenue and along Wolf Creek from the confluence with Comanche Creek to just <br />downstream of U.S. Highway 36. This has resulted in increases and decreases in SHFA width and <br />establishment of BFEs for the aforementioned reaches of Comanche Creek and Wolf Creek. An analysis <br />of Comanche Creek from just upstream of 26th Avenue to just downstream of U.S. Highway 36 has <br />resulted in a revised delineation of the regulatory floodway, increases and decreases in SFHA width, and <br />increased and decreased BFEs for this reach of Comanche Creek. An analysis of Little Comanche Creek <br />from the confluence with Comanche Creek to approximately 1,500 feet upstream has resulted in a revised <br />delineation of the regulatory floodway, increases and decreases in SFHA width, and decreased BFEs for <br />Little Comanche Creek. The table below indicates existing and modified BFE5 for selected locations <br />along the affected lengths ofthe flooding 50urce(s) cited above. <br /> <br />Location <br /> <br />Existing BFE <br />(feet)* <br /> <br />Modified BFE <br />(feet)* <br /> <br />Comanche Creek: <br />Just upstream of the Adams CountylWeld <br />County boundary <br />Just upstream of 26th Avenue <br />Approximately 5,200 feet upstream of 26th Avenue <br /> <br />None 4,893* <br />None 3" <br />5,356 5,357* <br />None 2" <br />None 2" <br />None 2" <br />None 1# <br /> <br />Comanche Creek Overflow: <br />Just downstream of 56th Avenue <br />Just downstream of Defoe Street <br />At 26th Avenue <br />Just downstream of U.S. Highway 36 <br /> <br />Little Comanche Creek: <br />Approximately 1,000 feet downstream <br />of U.S. Highway 36 <br /> <br />5,364 <br /> <br />5,362* <br /> <br />.:.K 0, <br />