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<br />. <br /> <br />. <br /> <br />for large, medium, and small farms, and the seven subregions of the Dis- <br />trict were represented by the aggregation of the three farm sizes in <br />~ the proportions actually found in each subregion. Constraints were im- <br />~ posed for total and peak season water use, high value crop acreages, cot- <br />~ ton allotments, and conserving crop (alfalfa) requirements. <br />QJ <br /> <br />Annual losses were estimated as the difference between experi- <br />enced 1970 net returns to water and land (using'TDS = 960 ppm) and the <br />optimized net returns in the year 2000, based on projected water quality <br />(1,280 ppm). For the Imperial Valley, the annual direct cost of this <br />salinity increase was found to be $7,595,000 or $23,734 for every part <br />per million increase in TDS. <br /> <br />Howe and Young4 estimated marginal losses in regional income in <br />the Arizona-Southern California region, excluding central Arizona, due to <br />salinity increases. They used a simple, small-scale profit maximizing <br />program and the two region input-output model of Ireri and Carter.5 <br />Their interval estimates of marginal damages are given in Table 1II-2. <br /> <br />TABLE 1II-2, MARGINAL DIRECT PLUS INDIRECT LOSSES <br />IN ARIZONA-CALIFORNIA <br />Regional Income Caused by Salinity <br /> <br />Salinity Concen- <br />tration Intervals (mg/l) <br /> <br />900 - 1,100 <br />1,100 - 1,200 <br />1,200 - 1,300 <br />1,300 - 1,400 <br /> <br />Losses in <br />1974 Dollars (per mg/l) <br /> <br />$ 80,000 <br />239,000 <br />290,000 <br />643,000 <br /> <br />These figures count all the direct farm income losses plus the indirect <br />income losses to regional households and government units. Thus, the <br /> <br />4"Indirect Economic Impacts from Salinity Damages in the Colorado <br />River Basin," Appendix 7 in Jay C, Andersen and Alan p, Kleinman (eds.), <br />Salinity Management Options for the Colorado River, Report P-78-003, Utah <br />Water Research Laboratory, Utah State University, Logan, Utah, June 1978. <br /> <br />5D. Ireri and H.O. Carter, "California-Arizona Economic Inter- <br />dependence and Water Transfer Models," Giannini Report No. 313, Califor- <br />nia Agricultural Experiment Station, 1970. <br /> <br />III-5 <br />