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<br />~ <br /> <br />PREFACE <br /> <br />This report is part of a program by the Colorado Water Conservation Board (CWCB) to make <br />approximate floodplain maps prepared by the Federal Emergency Management Agency (FEMA) <br />easier for local governments to use. This CWCB report provides limited engineering information <br />to support the approximate delineations on the maps, and it provides floodplain management <br />information to guide the local governments in the use of the maps. <br /> <br />The official floodplain information for Lake County is the Flood Hazard Boundary Map (FHBM), <br />dated October 18, 1977. The FHBM was prepared by the Federal Insurance Administration (PIA), <br />however this federal map does not have any published information accompanying it to describe <br />either the engineering basis of the map or the manner in which the county could use it for floodplain <br />management The initial purpose of this report, therefore, is to provide the county with limited <br />supporting information. The report includes a description of a hydrologic analysis that was <br />performed for the county as part of the CWCB's technical assistance program. The hydrologic <br />analysis is consistent with the map in this report. In addition, the report gives the county some <br />basic information about floodplain management and it gives some alternatives that could be <br />considered in formulating and implementing its floodplain management objectives. <br /> <br />A second function of this report is to assure that the FHBM meets the basic technical requirements <br />for designation and approval by the CWCR Without a report and without a hydrologic analysis, a <br />map like the FHBM for Lake County cannot qualify for CWCB designation, Colorado statutes <br />require that local governments obtain from the CWCB the designation and approval of floodplain <br />information prior to its use for regulatory purposes. This report provides a means for the FHBM to <br />meet that statutory objective. <br /> <br />The FHBM was prepared prior to the completion of a CWCB document entitled "Guidelines for <br />Determining lOO-year Flood Flows for Approximate Floodplains" (Guidelines), That document <br />provides the necessary hydrologic information in support of the lOO-year floodplain boundaries <br />identified on the FHBM. The hydrologic information contained in the Guidelines was used in <br />preparing this report and it supports the subsequent designation of the Lake County FHBM, <br />