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. INTRODUCTION Purpose and Scope This Hydrology Addendum was prepared to provide supporting documentation for the approximate IOO-year floodplain boundaries shown on Jefferson County FIS, dated July 4, 1989. The FIS was prepared using both detailed and approximate floodplain mapping techniques. Engineering information was not provided by FEMA to support the approximate floodplain delineations shown on the FIS and FIRMs. This Addendum provides limited engineering information to fulfill that need. This Addendum includes: I. Authorization for the report and its pmpose and scope; 2. Study area description including information on the community, the watershed, any known flooding historylflooding 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. S. References Authorization The CWCB has certain statutory responsibilities relating to the designation and approval of floodwater 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 Counties, to County planning commissions, and to boards of adjustment of cities, incorporated Counties, 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 Jefferson County, Colorado. The CWCB has prepared this Addendum as a means of designating Jefferson County's FIS so that the community can better implement its floodplain management program. . 1