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<br />~ <br />r-- <br />C".J <br />C> <br /> <br />~) <br /> <br />CHAPTER III <br /> <br />PROBLEMS AND NEEDS <br /> <br />, <br />-. <br /> <br />The salt loading within the Grand Valley Unit is estimated at <br /> <br />approximately 580,000 tons annually, resulting in a 58. 6-mg/L annual <br /> <br />increase in salinity at Imperial Dam. <br /> <br />This estimate of salt loading <br /> <br />from the Grand Valley Unit area is significantly less than the 780,000- <br /> <br />ton estimate presented in the 1980 Definite Plan Report (DPR) as a result <br /> <br />of ongoing data collection and evaluation and the refinement of tech- <br /> <br />niques used to compute salt loading since that report was prepared. <br /> <br />21 <br />