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namely, that resulting from the acidity and attendant alkalinity destruc- tion, and that due to precipitation of iron and aluminum hydro:r.:ides re- sulting in discoloration and an increased suspended ma,tt'll' load in the stream. o C'7) .- W ~ CO In the Kansas portion of the Neosho Basin two serious water quality problems, from a lIIIIDicipal water supply standpoin~, are tho/!! associated -with tastes and odor.s resulting principally from biologicaJ. growths in the Neosho River and those of high chloride (salt) content. Taste and odor~ problems are generaJ.ly the result of biological (algae) growths in the stream. No biological quality data are available. Tastes and odors can be combatted by various water treatment methods, however, municipalities can do nothing to reduce the salt content of water, During a 1934 low flow period in the Neosho River, maximum chloride values in excess ofSOO ppm (recommended maximum concentration, 250 ppm) were recorded at st. Paul, Kansas. Improved oil brine disposal practices have resulted in improvement during recent years. Stream pollution and attendant water quality problems in the lower Grand (Neosho) River (Oklahoma) are less serious. The quantity of water in the Grand, as well as its good quality, makes this stream one of those well worth preserving as a valuable water resource. :!he principal foci of municipal and industrial, including mine, pollution are ill the northeastern Oklahoma portion of the basin. Water quaJ.ity in the lower portion of the basin is, in general, satisfactory. . The means of improving the quality of water ill the streams and lakes of the basin, ill generaJ., consist of pollution preventive measures and dilu- tion of wastes that are not prevented from entering the water. :!he preven- tive measures include the treatment in modern waste treatment plants of industrial and municipal wastes, sub-surface disposal of oil field brine., the sealing of worked-out mines, and the control of soil erosion. Since many of the streams of the basin have criticaJ. periods of little or no flow under present conditions, dilution of polluting materials is best accomplished by storage dams designed to maintain the greatest possible minimum flows, not only on the larger streams, but also on as many of the tributaries as may be economically possible, North Canadian River Basin In New Mexico where precipitation is rather high, and the rocks are usually non-sedimentary, soft water low in dissolved minerals is found in practically all streams. East of the mountains, the North Canadian River and its tributaries flow through regions with outcrops of gypsum so that much of the time their water carries considerable calcium sulfate in solution. Water quality in the North Canadian River may be considered as suitable for all uses down to Oklahoma City, Oklahoma from the headwaters. 5-12