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I I I I I I I I I I I I I I I I I I I 1.0 INTRODUCTION 1.1 Purpose This report was prepared to guide local officials in planning the use and regulation of the floodplain areas such that flood hazards and future flood damages are minimized. It includes information on historical floods, existing factors which influence the flood hazard. and the nature and extent of probable future floods. The report data consist of floodplain delineation maps showing the approximate 100-year flood boundary. A supplement to this report in the form of a technical addendum includes the supporting engineering and hydrologic data which may also be used in the location and design of roads. bridges and channel modifications. 1.2 Authorization This report was prepared by the Colorado Water Conservation Board at the request of Costilla County. The Board's responsibility is... ".. .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 floodway 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. .." as stated in Section 37-60-106(1)(c) of the Colorado Revised Statutes. The legislative bodies of local jurisdictions (counties/towns) may provide zoning regulations... ".. .to establish. regulate, restrict, and limit such uses on or along any storm or floodwater runoff channel or basin. as such storm or floodwater runoff channel or basin has been designated and approved by the Colorado Water Conservation Board. in order to lessen or avoid the hazards to persons and damage to property resulting from the accumulation of storm or floodwaters. .." -1-