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<br />Based on data from: <br />(I) USGS, Professional Paper 441, '"Water Resources of the Upper Colorado River Basin, Technical Report;'1965. <br />(2) USDI, Progress Report No.3, "Quality of Water, Colorado River Basin," January 1967. <br />(3) FWPCA unpublished records. <br />Concentrations in this column will vary depending upon the order in which they are calculated. <br /> <br />tit <br />C." <br />E;v <br />I'IIlm <br />~r- <br />- <br />...~ <br />0_ <br />;aZ <br />~. <br />~~ <br />o <br />z <br /> <br />Factor <br /> <br />Natural Diffuse <br />Sources <br /> <br />Natural Point <br />Sources <br /> <br />Irrigation (Salt <br />Contribution) <br /> <br />Irrigation (Con- <br />sumptive Use) <br /> <br />'Municipal & In- <br />dustrial Sources <br /> <br />Exports Out of <br />Basin <br /> <br />Evaporation & <br />Phreatophytes <br /> <br />TOTAL <br /> <br />Y <br /> <br />!Y <br /> <br />002000 <br /> <br />EFFECT OF VARIOUS FACroRS ON SALT CONCENTRATION <br />AT HOOVER DAM, COLORADO RIVER BASIN <br />(1942-61 period of record adjusted to 1960 condition)Y <br /> <br /> Cumulative Salt Cumulative <br />Flow Flow Load Salt Load Cumulative Changeb/ in <br />(l , 000 (l , 000 (l ,000 (l ,000 Concentration Concentration % of Total ,....". <br />Ac-Ft/yo Ac-Ft/yr) Tons/yr) Tons/yr} Tons/Ac-Ft 1Iip;/1 mp;/l Concentration <br /> <br />15,228 15,228 5,982 5,982 0.393 289 289 <br />365 15,593 1,300 7,282 0.467 343 54 <br />0 15,593 3,500 10,782 0.691 508 165 <br />-2,300 13,293 0 10,782 0.8ll 596 88 <br />-30 13,263 160 10,942 0.825 606 10 <br />-500 12,763 -40 10,902 0.854 628 22 <br />-1,700 II ,063 0 10,902 0.985 725 97 <br /> II ,063 10,902 725 <br /> <br />40 <br /> <br />8 <br /> <br />23 <br /> <br />12 <br /> <br />1 <br /> <br />3 <br /> <br />13 <br /> <br />100 <br />