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<br />Table 30 -IRRIGATION AND AVERAGE ANNUAL FARM DELIVERY REQUIREMENTS OF <br />IRRIGATION WATER, 1965 <br /> <br />Subbasin <br /> <br />Current Current <br />Fulllnigation Intermittent Irrigation <br /> <br />(Thousand Acres) <br /> <br />Upper Missouri <br />Yellowstone <br />Western Dakota <br />Eastern Dakota <br />Platte-Niobrara <br />Middle Missouri <br />Kansas <br />Lower Missouri <br /> <br />Missouri Basin <br /> <br />1,102 <br />1,188 <br />209 <br />119 <br />2,986 <br />103 <br />1,703 <br />5 <br /> <br />7,415 <br /> <br />418 <br />235 <br />198 <br />113 <br />150 <br />o <br />o <br />o <br /> <br />1,114 <br /> <br />Average Annual <br />Water Requirements1 <br />(Thousand AF) <br />1,984 <br />2,376 <br />376 <br />178 <br />5,673 <br />103 <br />3,406 <br />5 <br />14,101 <br /> <br />lCurrent full irrigation only. <br /> <br /> <br />Diversion Works And Canals Complement Reservoirs For <br />Dependable Irrigation <br /> <br />Flood and Erosion Control <br /> <br />Various programs and protective works already are in <br />operation throughout the basin to reduce flood and <br />erosion damages as shown in figure 47. It is im- <br />practicable to identify all improvements. Many improve- <br />ments made by individuals or by small groups in local <br />areas have, in fact, reduced losses but such effects for <br />the most part have been reflected in the historical <br />experience. <br /> <br /> <br />':- -,::"'-- __''"1_ ..___"-.,.. _.~"..", _ . _ . <br /> <br />About 5,800,000 acres have been developed for <br />service by group irrigation systems, of which nearly <br />138,000 acres are Indian lands. These group develop- <br />ments show an aggregate reservoir storage capacity of <br />nearly 9 million acre-feet, often used for multipurposes, <br />and about 42,000 miles of group-delivery canals. About <br />45 percent of the storage capacity for group irrigation <br />systems is in reservoirs constructed by irrigation <br />districts, water companies, or the States, with Federal <br />construction accounting for the remaining storage Flood control and flood damage prevention in the <br />capacity. About 75 percent, or 32,000 miles, of the basin are achieved by measures involving multiple- and <br />group-delivery canals was constructed by non-Federal single-purpose storage reservoirs, channel improvements <br />in terests and 25 p-ercelJL9_cLQ,OOO_miles .by .Eeder~andJ~ve.e.s,_and _upstream_watershe.d_projects._Ry....l9_65. <br />agencies. In many instances federally constructed 228 federally constructed projects involving direct flood <br />irrigation works also provide supplemental water to control measures were completed or under construction <br />non-federally constructed irrigation systems. Some of in the basin. These included 53 major reservoirs, 57 <br />the group irrigation systems are unable to provide an channel and levee projects, and 118 upstream watershed <br />adequate water supply to portions of the 5.8 million projects. Throughout the basin, the channel and levee <br />acre service area. These requirements, together with prajects involve about 1,200 miles of levee construction <br />associated requirements for canal and lateral rehabilita- and about 800 miles of channel improvements. Up- <br />tion, are discussed in chapter 8. stream watershed projects involve watersheds totaling <br /> <br />70 <br /> <br />Heightened Floodwalls Protected Omaha From <br />1952 Record Flood <br />