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. INTRODUCTION Authorization The CWCB has certain statutory responsibilities relating to the designation and approval of flood water runoff channels or basins as follows: '" "to devise and formulate methods, means, and plans for bringing about the greater utilization of the waters of the state and the prevention of flood damages therefrom, and to designate and approve storm or floodwater runoff channels or basins, and to make such designations available to legislative bodies of cities and incorporated towns, to county planning commissions, and to boards of adjustment of cities, incorporated towns, and counties of this state""" Section 37-60-106(1)(c) of the Colorado Revised Statues (CRS), A CWCB designation and approval of current floodplain information is needed for the unincorporated areas of Chaffee County, Colorado. The CWCB has prepared'this addendum as a means of designating Chaffee County's FrS so that the community can better implement its floodplain management program. Purpose and Scope . This Hydrology Addendum was prepared to provide supporting documentation for the approximate lOO-year floodplain boundaries shown on the Chaffee County FrS, dated March 4, 1987, The FrS was prepared using both detailed and approximate floodplain techniques, Engineering information was not provided to support the approximate floodplain delineations of the FrS, This addendum provides limited engineering information to fulfill that need, This addendum includes: I, Authorization for the report and its purpose and scope; 2. Study area description including information on the community, the watershed, any known flooding history/flooding problems, previous studies and projects, and community response to the CWCB designation and approval process; 3. Description of hydrologic and hydraulic information; and 4. Floodplain management program, .