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~~~ development involving residential subdivisions gr~at~r than 50 lots or occurring on sites gr;~~ ~an 5 acres~ommercial construction, industrial cons' c IOn 0 pu lC IOn~ aClhtles, or construction of flood control facilities. The Town of Fairplay should regulate the approximate floodplains on a case-by-case basis subject to a detailed hydrologic and hydraulic analysis. A detailed floodplain analysis may be required in certain cases and should be performed by a professional engineer and submitted by the developer or development proponent. An approximate floodplain analysis can be submitted by a developer or development proponent, for the cases listed above, in accordance with the determinations of the Colorado Water Conservation Board regarding the applicability of the Guidelines. Hvdraulic Analvsis The hydraulic analysis for the preparation of the original FHBM, which is the source of the existing FIRM, likely consisted of interpretation of USGS quadrangle mapping by HUD's engineering consultant, along with telephone discussions with local officials. The telephone discussions addressed any historic flood problems that may have occurred in Fairplay. The FIA did perform and did not have the benefit of any detailed hydrologic and hydraulic analyses for the preparation of the FHBM. The hydraulic analysis for the preparation of the FHBM for nnincorporated Park County, including map panel # 9, part of which is included in this report, was most likely very similar to the analysis for the Town of Fairplay. No detailed analyses were performed for unincorporated portions of the county. Future hydraulic analyses, submitted by developers or development proponents, for determining I DO-year water surface elevations for approximate floodplains may be computed using FEMA's Quick-2 computer program, the Corps of Engineers' HEC-2 computer program, or other acceptable hydraulic methods. Floodplain Mappin2 The official floodplain information for the Town of Fairplay is the Flood Insurance Rate Map (FHBM), dated August 5, 1986. The FIRM was originally prepared by the Federal Insurance Administration (FIA) as a Flood Hazard Boundary Map (FHBM) on July 18, 1975. It was converted into a FIRM by a reprinting that involved no changes other than the title of the map. That reprinting occurred on August 5, 1986. In addition to the town's FIRM, the portion of map panel # 9 of the FHBMs for unincorporated Park County, dated November 22, 1977, that is now within the corporate limits of Fairplay is also part of the town's official floodplain mapping. The FIRM and the applicable portion of map panel # 9 of the Park County FHBMs are the only available floodplain mapping for the Town ofFairplay at this time. _ ~ ~P~cJ~~ The town's consulting drainage engineer, Mr. Kent Baker of ???, is currently preparing a master drainage plan for the town. The master drainage plan will include a detailed hydrologic analysis and a detailed hydraulic analysis for Beaver Creek within the current corporate limits. At this time it is not anticipated that a detailed analysis will be performed for the Middle Fork of the South Platte River. It is recommended that the new detailed information being developed for Beaver Creek should be submitted to FEMA at a future date to replace the approximate information currently shown on map panle # 9 of the Park County FHBMs. Based on CWCB field observations