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<br />December 1996 <br /> <br />PREFACE <br /> <br />This hydrology addendum is part of a program by the Colorado Water Conservation Board <br />(CWCB) to make approximate floodplain maps prepared by the Federal Emergency Management <br />Agency (FEMA) easier for local governments to use, This CWCB report provides limited <br />engineering information to support the approximate delineations on the maps, and it provides <br />floodplain management information to guide the local governments in the use of the maps. <br /> <br />The official floodplain information for Buena Vista is the Flood Insurance Study (PIS) with its <br />associated Flood Insurance Rate Maps (FIRMs), dated March 30, 1982, The FrS was prepared by <br />FEMA, and includes engineering information for those streams that were studied in detaiL <br />However it does not include any engineering information to describe basis of the approximate <br />floodplain mapping, The initial purpose of this report, therefore, is to provide the Town with <br />limited supporting information for the approximate floodplain delineations, This addendum <br />includes a description of a hydrologic analysis that was performed for the Town as part of the <br />CWCB's technical assistance program, The hydrologic analysis is consistent with the FEMA <br />mapping, In addition, the addendum gives the Town some basic information about floodplain <br />management and it gives some alternatives that could be considered in formulating and <br />implementing its floodplain management objectives, <br /> <br />A second function of this report is to assure that the PIS meets the basic technical requirements for <br />designation and approval by the CWCB, Without a hydrologic analysis, the approximate floodplain <br />information in the Buena Vista PIS cannot qualify for CWCB designation, Colorado statutes <br />require that local governments obtain from the CWCB the designation and approval of floodplain <br />information for its use in regulatory purposes, This addendum provides a means for the PIS to meet <br />that statutory objective, <br />