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<br />location and diversion demands for assumed individual <br />thermal plant locations were estimated and these data <br />furnished the planners as water quality needs to comply <br />with streamflow temperature standards. <br />Currently the average total dissolved-solids concen- <br />tration of the Missouri River flow at the mouth is about <br />390 mg/ I. The maximum average annual main stem <br />concentration is about 470 mg/l at Sioux City, la., and <br />Omaha, Nebr. Several tributary stream reaches have high <br />concentrations of dissolved solids such as the South <br />Platte River at Julesburg, Colo., with 1,480 mg/l, and <br />the Cheyenne River at Eagle Butte, S. Dak" with <br />1,005 mg/ I. Any further basin development that uses <br />and further depletes the existing water supply will <br />increase the average concentration of dissolved solids. <br />Without some kind of technological breakthrough, this <br />form of degradation of water quality is inevitable. <br />Maintenance of desirable and acceptable dissolved-solids <br />quality is one need to be considered in connection with <br />the planning of all potential water resource develop- <br />ments. <br />The water-quality degradation of surface and ground <br />waters and the degree and sources of pollution are not <br />well known. Data are available which have yet to be <br />analyzed, and there is a need for additional data, A solid <br /> <br />8 <br /> <br />technical base is a prerequisite to implementation of the <br />actions necessary for improving water quality. To <br />achieve this objective there must be continued effort to <br />identify and quantify waste sources; there should be <br />obtained better quantity and quality data on the basin's <br />streams and ground waters; and the economic effects of <br />water quality must be evaluated. <br /> <br />****** <br /> <br />AFTERWORD <br /> <br />Such is the kaleidoscope of people, land, and water <br />called the Missouri River Basin, In the chapters ahead, <br />these basic elements are examined to determine trends <br />and capabilities which will contribute toward a balanced <br />resource development in the basin during the nex t 50 <br />years. <br />The "needs" set forth in this appendix are estimated <br />requirements which, if met, will guide planners in <br />attaining a balanced basin development through the year <br />2020. It is emphasized that they are requirements only. <br />Discussion as to the prospect of providing appropriate <br />works and other methods to meet these requirements is <br />beyond the scope of this particular appendix, <br />