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<br />It <br /> <br />. <br /> <br />CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE TOWN <br />OF CASTLE ROCK, DOUGLAS COUNTY, COLORADO, UNDER THE NATIONAL FLOOD <br />INSURANCE PROGRAM <br /> <br />On September 30, 1987, the Federal Emergency Management Agency (FEMA) identified Special <br />Flood Hazard Areas (SFHAs) in the Town of Castle Rock, Douglas County, Colorado, through issuance <br />of a Flood Insurance Rate Map (FIRM). <br /> <br />The Mitigation Directorate has determined that modification of the elevations of the flood having <br />a I-percent chance of being equaled or exceeded in any given year (base flood) for certain locations in <br />the Town of Castle Rock is appropriate. The modified base flood elevations (BFEs) revise the FEMA <br />FIRM for the community. <br /> <br />The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 <br />(Public 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. 4001- <br />4128, and 44 CFR Part 65. <br /> <br />A hydraulic analysis was performed to show the effects of the construction of storm drainage <br />improvements and erosion protection measures along Hangmans Gulch and has resulted in a revised <br />delineation of the regulatory floodway and SFHA, and lower BFEs from Frontage Road to approximately <br />4,600 feet upstream of Frontage Road. The table below indicates the modified BFEs for several locations <br />along the affected length of Hangmans Gulch. <br /> <br />Location <br /> <br />Existing BFE <br />(feet)* <br /> <br />Modified BFE <br />(feet)* <br /> <br />Just upstream of Frontage Road <br />Approximately 2,400 feet upstream of Frontage Road <br />Approximately 4,600 feet upstream of Frontage Road <br /> <br />6,195 <br />6,265 <br />6,298 <br /> <br />6,195 <br />6,255 <br />6,298 <br /> <br />*National Geodetic Vertical Datum, rounded to nearest whole foot <br />