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<br />FIGURE 14 <br /> <br />GROUND-WATER WITHDRAWALS BY BASIN STATES <br />(MISSOURI BASIN PORTION) <br />~\ <br /> <br /> <br />~JI <br /> <br />LEGEND <br /> <br />,.11 <br />IU <br />1951- 1956- 1961- <br />1955 1960 1965 <br /> <br />COILORADO <br /> <br />. ..__. __ . ........ ~....A'._ <br />""I:.IIAUI:. """VA'" rUllllrAUI: <br /> <br />I II THOUSAND ACRE FEET <br /> <br />TOTAL - MISSOURI BASIN <br /> <br />Ground-Water Quality <br /> <br />Ground-water quality is generally rela ted to the <br />geologic formations from which the water is withdrawn. <br />Although nearly all geologic formations yield some <br />water, relatively few yield water of good quality in large <br />quantities. The chemical quality of water from meta- <br />morphic and igneous rocks of the basin is generally <br />good. However, water recovered from the sedimentary <br />rocks ranges in chemical quality between the saturated <br />brines found in deeply buried marine rocks to water <br />with total-dissolved-solids concentrations less than ] 00 <br />milligrams per liter found in certain near-the-surface <br />formations. Most water originating in dune-sand areas is <br />of good quality, as that in the Sand Hills of Nebraska. <br />Water originating in loess is somewhat more mineralized <br />since calcium carbonate usually is present below the <br />zone of weathering. Chemical quality of water from <br /> <br />22 <br /> <br />~ <br /> <br />CANADA <br /> <br />~ <br /> <br />. <br /> <br />t <br /> <br />DAKOTA <br /> <br />SCALE I/II.~OC.OOO <br />o 100 <br />APPROXIMATE SCALE IN MILES <br /> <br />KANSAS <br /> <br />~ <br /> <br />glacial deposits varies. In those deposits overlain by thick <br />beds of gaIcial till, ground water is almost stagnant and <br />may contain appreciable amounts of dissolved material <br />from underlying marine deposits. Where glacial deposits <br />are subject to circulation, however, the quality of <br />ground water is generally good. Ground water in most <br />valley alluvia is derived from local recharge and la teral <br />inflow from nearby streams and aquifers. The alluvium <br />along many streams contains ground water with rela- <br />tively high concentrations of sulfates derived from <br />nearby rocks rich in gypsum. Where ground-water use is <br />high and alluvium aquifers are subject to recharge from <br />streams, ground-water quality is controlled in part by <br />the quality of the water in the stream. <br />The vast size of the basin and the range that exists in <br />the parameters of water quality make impractical a <br />detailed presentation of all available data concerning <br />quality of ground waters in the Missouri Basin. While <br />