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. . . . . . PREFACE . . This Hydrology Addendum (HA) is part of a program by the Colorado Water Conservation Board . (CWCB) to make approximate floodplain maps prepared by the Federal Emergency Management . Agency (FEMA) easier for local governments to use, This CWCB report provides limited . engineering information to support the approximate delineations on the FEMA maps, and it . provides floodplain management information to guide the local governments in the use of the maps, . . The official floodplain information for San Miguel County and Incorporated Areas is the Flood . Insurance Study (FIS), dated September 30, 1992, The F1S was prepared by FEMA and contains . both detailed and approximate floodplain delineations, The approximate floodplains do not include . any engineering information to describe basis of the approximate floodplain mapping, The initial . purpose of this report, therefore, is to provide the County with limited supporting information for . the approximate floodplain delineations, This HA includes a description of available hydrologic . information for major flooding sources within or adjacent to the County, In addition, the HA gives . the County some basic information about floodplain management and it provides some alternatives . that could be considered in formulating and implementing floodplain management objectives, . . A second function of this report is to assure that the F1S meets the basic technical requirements for . designation and approval by the CWCR Without the inclusion of basic engineering information, . the approximate floodplain delineations shown on the San Miguel County Flood Insurance Rate . Maps (FIRMs) cannot qualify for CWCB designation, Colorado statutes require that local . governments obtain from the CWCB the designation and approval of floodplain information for its . use in regulatory pUlposes, This HA provides a means for the AS to meet that statutory objective, . As new and more detailed floodplain information becomes available, the approximate floodplain . areas shown on the FIRM panels will become superseded. The CWCB will designate and approve . new information, and rescind old information as appropriate, . . . . . . . . . . . . . . . . . . . . . li .