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<br />. <br />. <br />. <br />,. <br />I. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />INTRODUCTION <br /> <br />Purpose and Scope <br />This Hydrology Addendum was prepared to provide supporting documentation for the <br />approximate lOO-year floodplain boundaries shown in the Montrose County Unincorporated <br />Areas FIS, dated January 17, 1986. Portions of the Flood Insurance Rate Maps (FIRMs) <br />developed as part of the FIS were prepared using approximate floodplain mapping techniques. <br />Engineering infonnation was not provided by FEMA to support the approximate floodplain <br />delineations shown on the FIRMs. This HA provides limited engineering infonnation to fulfill <br />that need. <br /> <br />This HA includes: <br /> <br />1. Authorization for the report and its purpose and scope; <br /> <br />2. Study area description including infonnation on the community, the watershed, any known <br />flooding historylflooding problems, previous studies and projects, and community response <br />to the CWCB designation and approval process; <br /> <br />3, Description of hydrologic and hydraulic infonnation; and <br /> <br />4. Floodplain management program. <br /> <br />Authorization <br />The CWCB has certain statutory responsibilities relating to the designation and approval of <br />floodwater runoff channels or basins as follows: <br /> <br />... "to devise and fonnulate methods, means, and plans for bringing about the greater <br />utilization of the waters of the state and the prevention of flood damages therefrom, and <br />to designate and approve stonn or floodwater runoff channels or basins, and to make such <br />designations available to legislative bodies of cities and incorporated Counties, to County <br />planning commissions, and to boards of adjustment of cities, incorporated Counties, and <br />counties ofthis state"... Section 37-60-106(1)( c) of the Colorado Revised Statues (CRS). <br /> <br />A CWCB designation and approval of current floodplain infonnation is needed for Montrose <br />County, Colorado. The CWCB has prepared this HA as a means of designating Montrose <br />County's FIS so that the community can better implement its floodplain management program, <br /> <br />1 <br />