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<br />.. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I: <br />. <br />. <br />. <br />I. <br />. <br />. <br />. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />. <br />. <br />I. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />PREFACE <br /> <br />This Hydrology Addendum (HA) 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 FEMA maps, and it <br />provides floodplain management information to guide the local governments in the use of the maps, <br /> <br />The official floodplain information for the Town of Gypsum is the Flood Insurance Study (FIS), <br />dated March 16, 1983. The FIS was prepared by FEMA and contains both detailed and <br />approximate floodplain delineations. The approximate floodplains do not include any engineering <br />information to describe the basis of the approximate floodplain mapping. The initial purpose of <br />this report, therefore, is to provide the town with limited supporting information for the <br />approximate floodplain delineations. This HA includes a description of available hydrologic <br />information for major flooding sources within or adjacent to the town. In addition, the HA gives <br />the town some basic information about floodplain management and it provides some alternatives <br />that could be considered in formulating and implementing floodplain management objectives. <br /> <br />A second function of this report is to assure that the FIS meets the basic technical requirements for <br />designation and approval by the CWCB. Without the inclusion of basic engineering information, <br />the approximate floodplain delineations shown on the Town of Gypsum Flood Insurance Rate <br />Maps (FIRMs) cannot qualifY for CWCB designation. Colorado statutes require that local <br />governments obtain from the CWCB the designation and approval of floodplain information for its <br />use in regulatory purposes, This HA provides a means for the FIRMs to meet that statutory <br />objective, As new and more detailed floodplain information becomes available, the approximate <br />floodplain areas shown on the FIRM panels will become superseded, The CWCB will designate <br />and approve new information and rescind old information as appropriate. <br /> <br />2 <br />