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. . . PREFACE This report 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 CWeB report provides limited engineering information to support the approximate delineations on the maps, and it provides floodplain management information to guide the local governments in the use of the maps. The official floodplain information for the Town of Walsh is the Flood Hazard Boundary Map (FHBM), dated June 28, 1974. The FHBM was prepared by the Federal Insurance Administration (FIA), however this federal map does not have any published information accompanying it to describe either the engineering basis of the map or the manner in which the town could use it for floodplain management. The initial purpose of this report, therefore, is to provide the community with limited supporting information. The report includes a description of a hydrologic analysis that was performed for the community as part of the CWCB's technical assistance program. The hydrologic analysis is consistent with the map in this report. In addition, the report gives the community some basic information about floodplain management and it gives some alternatives that could be considered in formulating and implementing its floodplain management objectives. A second function of this report is to assure that the FHBM meets the basic technical requirements for designation and approval by the CWCB. Without a report and without a hydrologic analysis, a map like the FHBM for Walsh cannot qualify for CWCB designation. Colorado statutes require that local governments obtain from the CWCB the designation and approval of floodplain information prior to its use for regulatory purposes. This report provides a means for the FHBM to meet that statutory objective. The FHBM was prepared prior to the completion of a CWCB document entitled "Guidelines for Determining 1 OO-year Flood Flows for Approximate Floodplains" (Guidelines). That document provides the necessary hydrologic information in support of the IOO-year floodplain boundaries identified on the FHBM. The hydrologic information contained in the Guidelines was used in preparing this report and it supports the subsequent designation of the Walsh FHBM.