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FPR 96-413 COLORADO WATER CONSERVATION BOARD 721 State Centennial Building 1313 Sherman Street Denver, Colorado 80203 March 13, 1996 RESOLUTION WHEREAS, the Federal Emergency Management Agency completed a floodplain information map entitled "Flood Hazard Boundary Map, Town of Westcliffe, Colorado, Custer County", dated August 13, 1976; and WHEREAS, said map includes approximate floodplain delineations for Grape Creek and Mill Gulch within the corporate limits of the Town of Westcliffe as of August 13, 1976 but does not include hydrology information for Grape Creek and Mill Gulch; and WHEREAS, the Colorado Water Conservation Board has not designated and approved said map; and WHEREAS, a new floodplain information report entitled "Floodplain Information Report, Town of West cliffe, Colorado, Custer County", dated February 8,1996 has been prepared by the Colorado Water Conservation Board; and WHEREAS, said new report for the Town of West cliffe includes approximate floodplain information for Grape Creek and Mill Gulch within the corporate limits of the Town of Westcliffe as of August 13, 1976; and WHEREAS, said new report incorporates the floodplain delineations of the Flood Hazard Boundary Map dated August 13, 1976; and WHEREAS, the hydrology in said new report for Grape Creek, Mill Gulch (aka Chloride Gulch) and South Tributary to Grape Creek has been estimated in accordance with the Guidelines for Determining lOO-Year Flood Flows for Approximate Floodplains; and WHEREAS, the 100-year flow for Grape Creek, Mill Gulch and South Tributary to Grape Creek is estimated by utilizing the regression equation for Arkansas River Basin Subregion Ark-6, Q100 = 45.98 * A 6.717, where QIOO is the 100-year peak flow in cubic feet per second and A is the upstream (contributing) drainage area in square miles; and WHEREAS, a procedure for determining hydrology information for approximate floodplains of lakes and ponds has not been established; and