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<br />FIGURE 27 <br /> <br />AVAilABILITY OF GROUND WATER <br /> <br />". ~I <br /> <br />~\ <br /> <br />~ <br /> <br /> <br />~ <br /> <br />. <br /> <br />t <br /> <br />SCALE 1/11.500.000 <br />o 100 <br /> <br />APPROXIMATE - SCALE IN MILES <br /> <br />MINNESOTA <br /> <br />LEGEND <br />. GREATER THAN 500 GPjIt <br /> <br />. 50 - 500 GPN <br /> <br />D LESS THAN sO GPM <br /> <br />KANSAS <br /> <br />g\ <br /> <br />COILOIUiJoO <br /> <br />---~r- <br /> <br />----t-~~~-- <br /> <br />information as is of record indicating that average annual <br />withdrawals in the Missouri Basin for the period <br />1951-1955 amounted to 2.2 million acre-feet; for <br />1956-19603.1 million acre-feet; and 4 million acre-feet <br />for the period 1961-1965. The distribution, by States in <br />the basin, of these estimates for the three time periods is <br />shown in figure 28. Projecting the data indicates that the <br />average annual withdrawal at the 1970 stage of ground- <br />water development is about 503 million acre-feet. <br />The-importan"ce-o-r-grbun-d:wa:te-r-resources to -tne~- <br />people of the basin can hardly be over-emphasized. <br />About 2 million of the 7.4 million acres of irrigated land <br />are served by ground water. Over 85 percent of the <br />1,773 municipalities of the basin serving 35 percent of <br />the people on central water systems use 580,000 <br />acre-feet of ground water per year. Approximately one <br />and a half million persons live in households with <br />individual pressure systems, of which 85 percent is <br /> <br />,i <br />.1\ <br />-$1 <br />,. (, <br /> <br />r7~~:S~th~\~f?'~ <br /> <br /> <br />\ <br />,0 <br /> <br />Ground Waters Furnish An On-Farm Irrigation Supply <br /> <br />62 <br />