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INTRODUCTI01\ Pm'pose and Scope This Hydrology Addendum (HA) was prepared to assure 1hat the March 16, 1995 revised FrS for La Plata County, Co:lorado, Unincorporated Areas, Ireet> the basic technical n'quirements for designation and approval by the CWCB. Colorado statutes require that local governments obtain from the CWCB the designation and approval of floodplain information for its use in regulatory purposes. This HA provides a means for the PIS to meet that statutory objective. This HA includes: 1. AuthOlization for the addendum and its purpose and scope; 2. Study area description including information on the community, the watershed, any known flooding history and flooding problems, previous ,.tudie;; and projects, and community response to the CWCB designation and approval process; 3. Description of hydrologic and hydraulic infonnation; and 4. Floodplain management information. AI~thoriz~tion The CWeB has certain statutoJry responsibilities relating to the designation and approval of floodwater runoff channels or basins as follows: ... "to devise and fonnulate methods, means, and plans for bringing about the greater utiization of the waters of the state and the prevention of flood damages therefrom, and to designate and approve storm or floodwater mnoJf channels or basins, and to make such de,.ignations available to legislative bodies of cities and incOlporated 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 (CftS). CWCB designation and approval is needed for the La Plata County, Colorado, Unincorporated Areas, March 16, 1995 revised FrS. The CWCB has prepared this HA as a means of designating La Plata County's PIS so that the community can better implement its floodplain management program.