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<br />,. <br /> <br />t- <br />--:l <br />N <br />0) <br /> <br />GS i' ,\ q '8''''F <br /> <br />. <br /> <br />. <br /> <br />DISSOLVED SOLIDS LOAD IN THE <br />UPPER COLORAOO RIVER BASIN <br /> <br />PREFACE <br /> <br />The hydrolog~c regime of the Upper Colorado River Basin has undergone major <br />changes since late 19th century, when the water resources of the basin began <br />to be developed for agricultural, municipal, and industrial uses. These water <br />resource use$ have continued to increase with growth in population and land <br />development, Diversion of flow from channels, storage of water in reservoirs, <br />and increase~ mining development have affected the distribution and timing ~f <br />streamflow and the water quality. <br /> <br />In 1984, the:U.S. Geological Survey began investigations in the Upper Colorado <br />River Basin to determine the affects of water resource use on the water <br />quality of the Colorado River and its major tributaries, This volume bring~ <br />together thr~e reports which describe historical changes in the surface~water <br />hydrology and water quality in the Upper Colorado River Basin that have <br />occurred since the early 1900's. <br /> <br /> <br />"~<. <br /> <br />1 <br />, <br />,~. <br /> <br />2 <br /> <br />;.~~ <br />{ <br /><~: <br />i:~ <br />,1: <br />'J <br />.j-..:-} <br />'i"~'.1 <br />'d",v;. <br />~>. <br />d;.:- ;..ik I <br /> <br />i ,j <br /> <br />" "~- <br /> <br />~-_ o-o:i,__L <br />