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CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY OF BROOMFIELD, BOULDER AND JEFFERSON COUNTIES, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM On September 30, 1997, the Federal Emergency Management Agency identified Special Flood Hazard Areas (SFHAs) in the City of Broomfield, Boulder and Jefferson Counties, through issuance of a Flood Insurance Rate Map (FIRM). The Mitigation Directorate has detennined 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 perfonned to incorporate construction of the Broomfield Town Center project along City Park Channel. The project included extension of the culverts at West 120th Avenue; realignment and channelization along City Park Channel from just upstream to approximately 1,460 feet upstream of West 120th Avenue; construction of culverts at East First Avenue and Jefferson Court; construction of a drop structure approximately 1,460 feet upstream of West 120th Avenue; and other improvements along the split-flow area north of West 120th Avenue. This has resulted in a revised delineation of the regulatory floodway, a decrease in SFHA width, and increased and decreased BFEs for City Park Channel and increases and decreases in SFHA width and increased and decreased BFEs for the split-flow area north of West 120th Avenue. 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)* City Park Channel: Approximately 780 feet upstream of West 120th Avenue Approximately 1,220 feet upstream of West 120th Avenue Approximately 1,700 feet upstream of West 120th Avenue Approximately 2,160 feet upstream of West 120th Avenue 5,301 5,304 5,307 5,310 5,300 5,301 5,308 5,311 J;,''- Split-flow Area: Approximately 300 feet upstream of Sheridan Boulevard Approximately 1,400 feet upstream of Sheridan Boulevard 5,286 5,294 5,285 5,296 *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. Upon the second publication of notice of these changes in this newspaper, any person has 90 days in which he or she can request, through the Chief Executive Officer of the community, that the Mitigation Directorate reconsider the detennination. Any request for reconsideration must be based on knowledge of