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INTRODUCTION Authorization The Colorado Water Conservation Board. (Board) has certain statutory responsibilities relating to designation and approval of flood water runoff channels or basins as fi}llows: ... "to devise and formulate methods, means, aJld 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 towns, to connty planning commissions, and to boards of adjustment of cities, incorporate:d towns, and counties of this state"..., Section 37-60-106 (l)(c) of the Colorado Revised Statues (CRS). The Board's "Rules and Regulations for th,~ Designation and Approval of Floodplains and of Storm or Flood Runoff Channels in Colorado" allow the Board lmder certain conditions to: ..."take action at its own initiative to consider thc designation and approval of floodplain information"... (2 CCR 408-1, Rule 9.D.2). A current designation and approval of floodplain information is needed for the City of Las Animas (City), Bent County, Colorado. The designation will include rccognition ofthe modified I OO-year floodplain due to protection of the City by flood control structures and Ie:vees of the Las Animas Flood Control Project (Project). The Project wa~ designed and constructed by the U.S. Army Corps of Engineers (Corps) and constructioJl was completed on June 17, 1978. The Project was accepted for operation by the Arkansas River Conservancy District as of JUlie 17, 1978, by letter dated August 25, 1978. !'uroose and Scooe This Report documents the modified IOO-year floodplain which shows the benefits of the Las Animas Flood Control Project for the City of Las Animas. The Report includes: * Background flood hazard information for the City, * Acknowledgement of the Las ArLimas: Flood Control Project, * Hydrologic and hydraulic data, * Floodplain delineations and profiJes. * Recommendations of the Board staff regarding designation of the floodplain. Acknowledgements This Report was prepared from information obtained from the Corps and the Arkansas River Conservancy District. The assistance and cooperation of the following persons is acknowledged and is appreciated. Mark Wittrock and Gail Stockton, U.S. Army Corps of