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development involving residential subdivisions greater than 50 lots or occurring on sites greater than 5 acres, commercial construction, industrial construction, construction of public transportation facilities, or construction of flood control facilities, The City of Leadville should regulate the approximate floodplains on a case-by-case basis subject to a detailed hydrologic and hydraulic analysis performed by a professional engineer, 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 HOD's engineering consultant, along with telephone discussions with local officials. The telephone discussions addressed any historic flood problems that may have occurred in Leadville. The PIA did perform and did not have the benefit of any detailed hydrologic and hydraulic analyses for the preparation of the FHBM. A copy of the FHBM for Leadville is included in the Appendix at the end of this report. 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/Statutory Requirements Communities that manage their floodplains in Colorado do so most often through the local regulatory process. This requires a community to adopt an ordinance or regulation that 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 Leadville 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 information the standards require that residential buildings must be elevated above the lOO-year elevation and that non-residential buildings must be either elevated or floodproofed, Other structures or projects (i,e, bridges, culverts or fill) must be constructed in a way that minimizes the potential increase in flood elevations they may cause,