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<br />.e ~. <br /> <br />. <br /> <br />.r'-,: <br /> <br />. <br /> <br />? <br /> <br />,.,...:~",,~, <br /> <br />;"'":i~='.."""""""'_~- <br /> <br />'.-~~........_......._~,~..... .." ..~-..- <br /> <br />PART III-D <br /> <br />COLORADO RIVER BASIN <br /> <br />.1 <br />, <br />II <br />I <br />'I <br />11 <br />i <br />I <br />;1 <br /> <br />Located in the vicinity of P~fle are the world's largest known <br /> <br />afX shale reserves. These.reserves are as yet untouched but their <br /> <br />d~v.elopment is foreseen to help meet burgeoning demands for petroleum. <br /> <br />When this occurs large quantities of water will be required for the <br /> <br />i <br /> <br />" <br />I <br /> <br />ciL shale industry and associated municipal and industrial activities. <br /> <br />Present water needs of the mineral ir.dustry are mostly self-supplied. <br /> <br />Water use is moderate, maintenance of water quality in return flows is a <br /> <br />problem in some az,eas of the basin. <br /> <br />1ffi I <br />~ <br /> <br />Water diversions for the minerals industry in 1970 approximated <br /> <br />" <br /> <br />62:,,000 acre-feet. <br /> <br />~ <br /> <br />'1 <br />; <br /> <br />~"""~~_A...:..o-...~_~lI:;.l. :~~f. _' :..t::=..6.~=tlL..-z;r..;,::r~~~et:Y.a-::-e.t..~~'~:s <br /> <br />.. __'~L-O:"'.yJPt~~.......r . ~~..,~'!""'I"".).~ <br /> <br />1 <br />.' <br />I <br />"' <br />I <br />, <br /> <br />FLOOD CONTROL <br /> <br />. Floodwater damage has been relatively minor because of the low <br /> <br />population density and scarcity of industrial developments. Except <br /> <br />for temporary measures to alleviate flood daf.,ages, there have been no <br /> <br />maioI' flood control developments. Existing irrigation reservoir storage <br /> <br />aids in reducing peak flows by evacuating conservation storage to store <br /> <br />flood flows as the need is indicated by snowmelt runoff forecasts. <br /> <br />DRAINAGE <br /> <br />Host of the drainage problems in the irrigated lands have been <br /> <br />caused by one or more of the following factors: (1) improper water rnan- <br /> <br />agement practices including continuous irrigation, (2) seepage from <br /> <br />unlined canals and laterals, (3) rcstricted permeability in soil laycrs <br /> <br />oa~~ <br /> <br />:oz LJ-7 <br />32, <br /> <br />--_.__-._1 <br />