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<br />C'? <br />0) <br />0) <br />.-l <br />o <br />o <br /> <br />SOUllCES OF SALT LOAD <br />IN <br />COLORADO RIVER AT HOOVER DAM <br /> <br />TOTAL LOAD - 10.902.00,Q, TONS/YR. <br />(1942 - 1961 PERIOD OF RECORD ADJUSTED TO 1960 CONDITIONS) <br /> <br />1% MUNICIPAL 6< INDUSTRIAL SOURCES <br />(160,000 TONS/YR.) <br /> <br /> <br />55% <br />NATURAL ORIGIN - <br />DIPPUSE SOURCES <br />(5,982,000 <br />-40,000 (EXPORT) <br />5,942,000 TONS/YR.) <br /> <br /> <br />12% <br />NATURAL ORIGIN - <br />MINERAL SPRINGS AND O'nIER <br />POINT SOURCES <br />(1,300,000 TONS/YR.) <br /> <br />32% <br />IRRIGATION <br />(3,500,000 TONS/YR.) <br /> <br /> <br /> <br />Based on data from: <br />(1) USGS, Professional Paper, 441, '~ater Resources of the Upper Colorado River <br />BaSin, Technical Report," 1965. <br />(2) USDI, Progress Report No.3, "Quality of Water, Colorado River Basin," <br />January 1967. <br />(3) FWPCA unpublished records. <br /> <br />PRELIMINARY <br />SUBJECT TO REVISION <br /> <br />--~--' <br />