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Federal Emergency Management Agency Washington, D,C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 96-08-I58P The Honorable Paul E. Tauer Mayor, City of Aurora 1470 South Havana Street, Suite 808 Aurora, Colorado 80012 Community: City of Aurora, Colorado Community No.: 080002 Panels Affected: 0180 E Effective Date of This Revision: A P R 16 1996 102-I,A,C Dear Mayor Tauer: This is in response to a request for a revision to the effective Flood Insurance Study (FIS) and National Flood Insurance Program (NFIP) map for your community. Specifically, this responds to a letter dated February 27, 1996, from Mr. Bill DeGroot, P.E., Chief, Floodplain Management Program, Urban Drainage and Flood Control District, regarding the effective FIS report and Flood Insurance Rate Map (FIRM) for the City of Aurora, Colorado. Mr. DeGroot requested that the Federal Emergency Management Agency (FEMA) revise the effective FIRMs for the City of Aurora and the City and County of Denver, Colorado, to reflect the effects of the Westerly Creek Dam and chantlel improvements along Westerly Creek and to incorporate the results of more detailed hydrologic and hydraulic analyses of Westerly Creek from just upstream of the Kelly Road Dam to Havana Street. The corporate limits of the City of Aurora cross Westerly Creek approximately 1,400 feet downstream of Havana Street. All data required to complete our review of this request were submitted with Mr. DeGroot's February 27 letter. Because this Letter of Map Revision (LOMR) shows the effects of a publicly sponsored flood-control project that reduces flooding to existing development and incorporates more detailed information, fees were not assessed for the review. We have completed our review of the submitted data and the flood data shown on the effective FIRM, and have revised the FIRM to modify the elevations, floodplain boundary delineations, and zone designations of a flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Westerly Creek from approximately 1,400 feet downstream of Havana Street to just downstream of Havana Street and to add the base floodplain and elevations associated with the Westerly Creek Overflow. This revision also corrects the corporate limits shown on the FIRM for the City of Aurora. The base flood elevations (BFEs) decreased along Westerly Creek from approximately 500 feet downstream to just downstream of Havana Street. The maximum decrease in BFE, approximately 1.8 feet, occurs approximately 400 feet downstream of Havana Street. In addition, BFEs were added along Westerly Creek and Westerly Creek Overflow to reflect the results of the detailed hydrologic and hydraulic analyses performed for this revision. From approximately 850 feet downstream of Havana Street to the corporate limits approximately 1,400 feet downstream of Havana Street, the base flood discharge is contained within the channel of Westerly Creek. The width of the Special Flood Hazard Area (SFHA)