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I I I I I I I I I I I I I I I I I I I INTRODUCTION Purpose and Scope This Hydrology Addendum was prepared to provide supporting documentation for the approximate 100-year floodplain boundaries shown in the Arapahoe County and Incorporated Areas PIS, dated August 16, 1995. Portions of the Flood Insurance Rate Maps (FIRMs) developed as part of the PIS were prepared using approximate floodplain mapping techniques. Engineering information was not provided by FEMA to support the approximate floodplain delineations shown on the FIRMs. This HA provides limited engineering information to fulfill that need. This HA includes: 1, 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 information. Authorization The CWCS 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 Arapahoe County, Colorado; The CWCB has prepared this HA as a means of designating Arapahoe County's PIS so that the communities can better implement their floodplain management programs. 4