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<br />19 <br /> <br /> <br />w <br />w <br />o <br />~ <br /> <br />for 1960 and 1970, and 1,060 and 1,220 mg/l for 1980 and 2010 condi- <br /> <br />tions. The findings of the study with respect to s~linity sources <br /> <br />were that natural sources accounted for 47_ percent of the salini ty_ <br /> <br />concentrations at Hoover Dam. The remainder was accounted for by <br /> <br />irri!lltion (37 percent), reservoir evaporation (12 percent), out-of- <br />--~-------------------- <br /> <br />basin exports (3 percent), and M&I uses (1 percent). <br /> <br />The present an!luaLe_conomic detrimen~s of salinity were estimated <br />to total $16 million. The report further advises that if no salin- <br /> <br />ity controls are implemented, it is estimated that average annual <br /> <br />economic detriments would increase to $28 million in 1980 and $51 mil- <br /> <br />lion in 2010. More than 80 percent of these detriments would be <br /> <br />incurred by irrigated agriculture and the associated regional economy <br /> <br />located in the Lower Basin and the southern California water service <br /> <br />area. <br /> <br />The investigation examined three salinity control alternatives: <br /> <br />(1) augmentation of basin water s~ply, (2) basin-wide salt load <br /> <br />reduction program, and (3) limitation on further depletion of basin <br /> <br />water supply. The study concluded that the salt load reduction pro- <br /> <br />gram appeared to be the most feasible of the three alternatives. It <br /> <br />then proceeded to develop a broad conceptual plan and related costs <br />for such a program. <br />