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<br />TABLE 1 <br /> <br />EFFECTS OF VARIOUS FACTORS OF SALT LOADING <br />A T HOOVER DAM <br /> <br />(1942-61 Period of Record Adjusted to 1960 Conditions) <br /> <br />Source': "The Jvlinera1 Quality Problel <br />in the Colorado River Basin, <br />Summary Report", EP A, 1971 <br /> <br />€~8G <br /> <br /> . Portion of <br /> . <br /> . Salinity Concentration Salinity Concentration <br /> . <br /> . at Hoover Dam at Hoover Dam <br /> . <br /> Salt Load . Percent Ascribable to Ascribable to <br /> . <br /> (in Millions . of Each Source 11 Each Source 11 <br /> . <br /> Factor .of Tons) . Salt Load mg/1 Percent <br /> . <br /> Natural Diffuse Sources 5.41 50.4 275 39 <br /> Natural Point Sources 1.28 11.9 59 8 <br /> Irrigated Agriculture 3.54 33.0 253 37 <br /> Loading (3.54) 03.0) (178) (26) ., <br /> Salt <br />I <br />I-' (0) (75) (11 ) <br />w Salt Concentrating (0) <br />, <br /> Municipal and Industrial 0.15 1.4 10 1 <br /> Exports Out of the Basin -0.04 -0.4 20 3 <br /> Evaporation and 80 <br /> Phreatophytes 0.00 0.0 12 <br /> Storage Release From <br /> Hoover 2/ 0.39 ~ 0 0 <br />>-'l TOTAL 10.73 100.0 697 100 <br />ll> <br />0" <br />I~ <br />(1) <br />I-' <br /> <br />,. <br /> <br />!/ in addition to increases in salinity from salt loading, some factors also cause salinity <br />increases by removal of dilution water. The changes shown mAY resul~ from either or both. <br />31 Computed annual values for balancing based upon the net drawndown over the 1942-61 period: <br />