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<br />CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR lHE <br />UNINCORPORATED AREAS OF DOUGLAS COUNTY, COLORADO, UNDER TIIE NATIONAL <br />FLOOD INSURANCE PROGRAM <br /> <br />On September 30, 1987, the Department of Homeland Security's Federal Emergency Management <br />Agency identified Special Flood Hazard Areas (SFHAs) in the unincorporated areas of Douglas County, <br />Colorado, through issuance of a Flood Insurance Rate Map (FIRM). The Mitigation Division has <br />determined that modification of the elevations of the flood having a I-percent chance of being equaled or <br />exceeded in any given year (base flood) for certain locations in this community is appropriate. The <br />modified Base Flood Elevations (BFEs) revise 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 the effects of a new bridge across East Plum Creek <br />and culvert construction along Section 34 Tributary and Glade Gulch associated with the Bell Mountain <br />Ranch development; more detailed topographic information along East 'Plum Creek from approximately <br />2,000 feet upstream to approximately 4,200 feet upstream of the confluence with Section 34 Tributary; <br />and a revised hydrologic analysis for both Section 34 Tributary and Glade Gulch. This has resulted in a <br />revised delineation of the regulatory floodway, increases and decreases in SFHA width, and increased <br />BFEs for East Plum Creek; the establishment of BFEs and increases and decreases in SFHA width for <br />Section 34 Tributary from approximately 600 feet upstream to approximately 14,000 feet upstream of the <br />confluence with East Plum Creek; and the establishment of BFEs and a decrease in SFHA width for <br />Glade Gulch from approximately 2,400 feet upstream to approximately 6,000 feet upstream of the <br />confluence_with.East.Plum_Creek.....Ihe_table_below_indicates_existing.and.modified-BF'Es-for-selected <br />locations along the affected lengths of the flooding source(s) cited above. <br /> <br />Location <br /> <br />Existing BFE <br />(feet)" <br /> <br />Modified BFE <br />(feet)" <br /> <br />East Plum Creek: <br />Approximately 3,200 feet upstream of confluence <br />with Section 34 Tributary <br /> <br />6,378 <br /> <br />6,380 <br /> <br />Section 34 Tributary: <br />Approximately 700 feet upstream of confluence <br />with East Plum Creek <br />Approximately 7,000 feet upstream of confluence <br />with East Plum Creek <br />Approximately 13,000 feet upstream of confluence <br />with East Plum Creek <br /> <br />None <br /> <br />6,369 <br /> <br />None <br /> <br />6,502 <br /> <br />None <br /> <br />6,648 <br /> <br />Glade Gulch: <br />Approximately 600 feet upstream of Denver <br />and Rio Grande Western Railroad <br />Approximately 4,700 feet upstream of Denver <br />and Rio Grande Western Railroad <br /> <br />None <br /> <br />6,481 <br /> <br />None <br /> <br />6,600 <br /> <br />"National Geodetic Vertical Datum, rounded to nearest whole foot <br />