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. . . The Guidelines methodology is not appropriate for development involving residential subdivisions greater than 50 lots or occurring on sites greater than 5 acres, commercial construction, industrial construction, construction of public facilities, or construction of flood control facilities. The hydrologic methodology developed in the Guidelines is appropriate for designation and approval of approximate floodplain information and for use in simple floodplain analyses for development such as open space, agriculture, fann bridges, pole bams, and individual single residential structures, A procedure for determining hydrology information for approximate floodplains of lakes, ponds, local drainages, or overflows from irrigation canals and ditches has not been established, Bent County should regulate the approximate floodplains on a case-by-case basis, 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 FHBM 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 which may have occurred in Bent County, The PIA did perform and did not have the benefit of any detailed hydrologic and hydraulic analyses for the preparation of the FHBM, Future hydraulic analyses for determining lOO-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 MANAGEMENT Local Ordinance Requirements Communities which manage their floodplains in Colorado do so most often through the local regulatory process, This requires a community to adopt an ordinance or regulation which sets forth the performance standards by which development will occur in identified flood hazard areas, Nationwide and in Colorado, regulations are enforced within the area of the lOO-year floodplain, The basic requirement of these regulations is that new development and significant improvement of existing development cannot occur in the lOO-year floodplain without a floodplain development permit being obtained, Obtaining such a permit requires compliance with engineering standards, In communities like Bent County that have no detailed floodplain information with water surface elevations, the engineering standards are general, Structures must be built with materials and techniques that "minimize flood damages", In communities that have detailed floodplain 5