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<br />I. <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 />. <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 />. <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 ewCB 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 Montezuma County Unincorporated Areas is the Flood <br />Insurance Study (FlS), dated May 4, 1989, The FIS was prepared by FEMA and contains <br />approximate floodplain delineations. The approximate floodplains do not include any engineering <br />information to describe basis of the approximate floodplain mapping, The initial purpose of this <br />report, therefore, is to provide the County with limited supporting information for the approximate <br />floodplain delineations, This HA includes a description of available hydrologic information for <br />major flooding soun:es within or adjacent to the County. In addition, the HA gives the County <br />some basic information about floodplain management and it provides some alternatives that could <br />be considered in formulating and implementing 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 ewCB. Without the inclusion of basic engineering information, <br />the approximate floodplain delineations shown on the Montezuma County Flood Insurance Rate <br />Maps (FIRMs) cannot qualify for ewCB designation, Colorado statutes require that local <br />governments obtain from the ewCB the designation and approval of floodplain information for its <br />use in regulatory purposes, This HA provides a means for the PIS to meet that statutory objective, <br />As new and more detailed floodplain information becomes available, the approximate floodplain <br />areas shown on the FIRM panels will become superseded. The ewCB will designate and approve <br />new information, and rescind old information as appropriate, <br /> <br />ii <br />