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<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 local governments in the use of the maps. <br /> <br />Tht: effeclive floodphrin informa::ion for La Plata County, Colorado, Unincorporated Areas is the <br />Flood Insurance Study (FrS) of this title dated March 16, 1995. The FlS was prepared by FEMA <br />and contai ns both detailed and approximate floodplain delineations. The FrS does not include any <br />engineerin g information describing the basis of approxi mate floodplain mapping presented in the <br />report. Tle initial purpose of Ihis HA therefore, is to provide La Plata County with limited <br />supporting information for the approximate floodplain deliineations, This HA includes a description <br />of available hydrologic information for major flooding sources within or adjacent to the county. In <br />addition, the HA gives the county some basic infOll'la1tion about floodplain management and <br />provides SJme alternatives that could be considered in fonnulating and implementing floodplain <br />management objectives. <br /> <br />A second function of Ihis report is to assure that the FIS mcets 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 La Plata County Flood Insurance Rate Maps <br />(FIRMs) cannot qualify for CWCB dt:signation. Colorado statutes require that local governments <br />obtain from the CWCB the designaljon and IIpproval of floodplain information for its use in <br />regulatory purposes. This HA provides a means of meeting thai statutory objective, As new and <br />more detailed floodplain information becomes available, the: approximate floodplain areas shown <br />on the FIRM panels will gradually be superseded. The CWCB will desi!,'llate and approve new <br />infonnatiol, and rescind old information as appropriate, <br /> <br />ii <br />