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Federal Emergency Management Agency Washington, D.C. 20472 AUG 2 11998 LETTER OF MAP REVISION BASED ON FILL 218-65-F (RETURN) Community: Garfield County, Colorado Community No.; 080205 Map Panel Affected: 1354 B Map Effective Date: January 3, 1986 IN REPLY REFER TO CASE NO. 98-08-415A We reviewed a request dated August 6, 1998, for a Letter of Map Revision. All required information for this request was received on August 17, 1998. This property was elevated by the placement of fill after the date of the earliest National Flood Insurance Program (NFIP) map showing the area in a Special Flood Hazard Area (SFHA), the area that would be inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base flood). Using the information submitted and the effective NFIP map, we determined the property described below is in an SFHA designated Zone AO, Depth 1 foot, Velocity 4 feet per second. This area has been identified as being subject to alluvial fan flooding. Property Description: Lot 4, B.T.E. Minor Subdivision Street Address: 1595 East Seventh Street South Flooding Source: Ramsey Gulch The Federal Emergency Management Agency issues Letters of Map Revision Based on Fill (LOMR-Fs) upon determining that properties have been elevated by the placement of fill and are no longer within an SFHA. The procedures that result in the issuance of LOMR-Fs are provided in Section 65.5 of the NFIP regulations (copy enclosed). However, in areas subject to alluvial fan flooding, the provisions of Section 65.5 do not apply. (See Paragraph 65.13(b) of the regulations.) Alluvial fan flooding is characterized by high-velocity flows; erosion, sediment transport, and deposition; and unpredictable flow paths. Riverine floodplain mitigation strategies may not provide adequate protection in areas subject to alluvial fan flooding. Therefore, we do not issue LOMR-Fs in areas subject to alluvial fan flooding. We cannot review the submittal as a request for a LOMR-F and are returning the $425 check submitted with the request to defray the cost of our review. We based our determination on the flood data presently available. This determination does not preclude map changes resulting from more accurate analyses and/or data than those used to develop the NFIP map, or implementation of mitigation strategies appropriate for alluvial fan flooding. Requests for such changes should be submitted through the community and meet the data requirements as described in Part 65 of the NFIP regulations. Data submittal requirements for requests dealing with structural flood control measures in areas subject to alluvial fan flooding are described in Section 65.13 of those regulations. We trust this letter clarifies any confusion regarding our map revision process, particularly in areas subject to alluvial fan flooding, and the reasons we cannot revise the NFIP map based on the information submitted with this request. If you have any questions about this letter, please contact Ms. Sally P. Magee of our staff in Washington, DC, either by telephone at (202) 646-8242 or by facsimile at (202) 646-4596. Sincerely, ~ \ .\yt tC-/) )) (---1 ~ ,J '.....' Mike Grimm, Project Engineer Hazards Study Branch Mitigation Directorate For: Matthew B. Miller, P.E., Chief Hazards Study Branch Mitigation Directorate Enclosure