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<br />1-06. Existing struatures with impo:rtant :reguZato:ry effeats.- <br />Arkansas River flows above Las Animas are partially regulated by re~er- <br />voir storage. The only structure with significant regulatory effects i~ <br />Barrier Dam where surcharge storage reduces flood peaks. This dam will <br />be replaced by the authorized Pueblo Dam and Reservoir which is to be a <br />Bureau of Reclamation project. It will be a multiple-purpose structure <br />with 93,000 acre-feet of flood control storage. The flood control stor- <br />age of 93,000 acre-feet would store runoff above the site produced from <br />critical transpositions of the standard project storm above Las Animas. <br />With this control on the main stem of the Arkansas River the contribu- <br />ting drainage area for. the standard. project flood at Las Animas would <br />be reduced from 13,976 square miles-to 9,306 square miles. <br /> <br />1-07. Basia hyd:rologia data avaiZable.- There are 30 active <br />stream gaging stations in the Arkansas River subbasin above the author- <br />ized Las Animas project. Fifteen of the gaging stations are located <br />on the main stem and fifteen are located on tributaries. Additionally, <br />there are 7 gaging stations on the Purgatoire River. The Purgatoire <br />River enters the main stem of the Arkansas River just downstream from <br />Las Animas. The locations of these gaging stations are shown on plate <br />2. Pertinent data for selected gaging stations are given in table 2. <br /> <br />1-08. Precipitation data are available at many locations in the <br />subbasin. The locations of precipitation stations in and adjacent to <br />the subbasin are shown on plate 2. Climatological data are discussed <br />further in Section II of this memorandum. <br /> <br />1-09. Pe:rtinent :refe:renaes,- Data and methods used herein are <br />based upon information obtained from the following publications: <br /> <br />a. Climatologiaal Data, Colo:rado, published by Environmental <br />Science Services Administration, U.S. Weather Bureau; <br /> <br />b. EM 1110-2-1405, PZood-Hydrogzoaph Analyses and Computations, <br />August 1959, Corps of Engineers; <br /> <br />c. EM 1110-2-1408, Routing of Floods Th:rough Rive:r Channels, <br />March 1960, Corps of Engineers; <br /> <br />d. EM 1110-2-1409, Baak1J1ate:r Cu:rves in Rive:r Channels, <br />December 1959, Corps of Engineers; <br /> <br />e. U.S. Geological Survey Water-Supply Papers, Part 7, <br />L~e:r ~ssissippi Rive:r Basin; <br /> <br />f. Civil Works Bulletin 52-8, Standard Projeat Flood Dete:r- <br />minations, 26 March 1952, Corps of Engineers (to be issued as EM 1110-2- <br />1411) ; <br /> <br />g. Statistiaal Methods in Hydrology, 1962, Corps of Engineers; <br /> <br />3 <br />