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. . . PREFACE This Floodplain Information Report (FIR) 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 Town of Grand Lake is the Flood Insurance Rate Map (FIRM), dated January I, 1986. The FIRM was originally prepared as a Flood Hazard Boundary Map by the Federal Insurance Administration, and later converted to a FIRM by letter from FEMA, The map does not include any engineering information to describe the basis of the approximate floodplain mapping. The initial purpose of this report, therefore, is to provide the Town with limited supporting information for the approximate floodplain delineations. This FIR includes a description of available hydrologic information for major flooding sources within or adjacent to the Town. In addition, the FIR gives the Town 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 FIRM meets the basic technical requirements for designation and approval by the CWCB. Without the inclusion of basic engineering information, the approximate floodplain delineations shown on the Grand Lake FIRM 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 purposes. This FIR provides a means for the FIRM to meet that statutory objective. As new and more detailed floodplain information becomes available, the approximate floodplain areas shown on the FIRM panel will become superseded. The CWCB will designate and approve new information, and rescind old information as appropriate.