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~ CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY OF COLORADO SPRINGS, EL PASO COUNTY, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM On March 17, 1997, the Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the City of Colorado Springs, El Paso County, Colorado, through issuance of a Flood Insurance Rate Map (FIRM). The Mitigation Directorate has determined that modification of the elevations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) for certain locations in this community is appropriate. The modified base flood elevations (BFEs) revise the FIRM for the community. The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. A hydraulic analysis was performed to incorporate channelization of Peterson Field Drainage from approximately 900 feet upstream to approximately 6,500 feet upstream of Hancock Expressway and construction of two 8-foot by 9-foot concrete box culverts under Powers Avenue approximately 3,300 feet upstream of Hancock Expressway and two 8-foot by 9-foot concrete box culverts under Zeppelin Drive approximately 5,200 feet upstream of Hancock Expressway. This has resulted in a revised delineation of the regulatory floodway, a decrease in SFHA width, and decreased BFEs for the revised reach of Peterson Field Drainage from just upstream to approximately 6,500 feet upstream of Hancock Expressway. As a result of channelization, the base flood and floodway are contained in the engineered channel from approximately 2,000 feet upstream to approximately 6,500 feet upstream of Hancock Expressway. The table below indicates existing and modified BFEs for selected locations along the affected lengths of the flooding source(s) cited above. Location Existing BFE (feet)* Modified BFE (feet)* Approximately 1,300 feet upstream of Hancock Expressway Approximately 1,700 feet upstream of Hancock Expressway Approximately 2,000 feet upstream of H:mcock Expressway 5,962 5,967 5,972 5,960 5,963 5,965 *National Geodetic Vertical Datum, rounded to nearest whole foot Under the above-mentioned Acts of 1968 and 1973, the Mitigation Directorate must develop criteria for floodplain management. To participate in the National Flood Insurance Program (NFIP), the community must use the modified BFEs to administer the floodplain management measures of the NFIP. These modified BFEs will also be used to calculate the appropriate flood insurance premium rates for new buildings and their contents and for the second layer of insurance on existing buildings and contents.