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<br /> <br />Table 7 <br /> <br />SUMMARY OF ESTIMATES OF DIRECT AND INDIRECT SALINITY IMPACTS <br />ON AGRICULTURAL USERS BY AREA <br /> <br />Cost' <br />mg/l <br />per acre <br /> <br />Salinity <br />effects <br />per acre <br /> <br />Present <br />modified <br />acres <br /> <br />Area <br /> <br />Southern California <br />I mperiai County <br />Coachella Valley2 <br />MWD (San Diego)' <br />Palo Verde <br /> <br />$16 <br />59 <br />65 <br />16 <br /> <br />$0.050 <br />0.14B <br />0.203 <br />0.050 <br /> <br />526,000 <br />40,000 <br />32,500 <br />103,800 <br /> <br />Lower Main Stem <br />Colorado River Indian <br />Reservation <br />Remainder Yuma County <br /> <br />11 <br />23 <br /> <br />0.034 <br />0.072 <br /> <br />72,000 <br />146,000 <br /> <br />Giia Aree <br />Salt River Project <br />(CAP area)' <br />Gila Project <br /> <br />9 <br />21 <br /> <br />0.028 <br />0.066 <br /> <br />50,700 <br />105,000 <br /> <br />1,076,800 <br /> <br />TOTAL <br /> <br />Indirect effects-0.62 x 66,900 <br /> <br />TOTAL <br /> <br />Total <br />salinity <br />effect <br />cost per <br />mg/l/yea <br /> <br />$ 26,3 0 <br />7,5 0 <br />6,6 0 <br />5,2 0 <br /> <br />2,5 0 <br />10,5 0 <br /> <br />1.4~0 <br />6,90e <br />$ 66,9010 <br />41,500 <br />$108.406 <br /> <br />1 Cost per mg/l per acre was based on Sun's 1972 study which predicted a crop response to change in salin ty <br />$16 <br />concentration of 320 mg/l. 320 mg/l = $0.05 mg/l/acre. <br /> <br />2Twenty percent of the irrigation water comes from wells. The 40,800 acres represent SO percent of pres nt <br />modified acres. <br />'Represents only that portion of agricultural lands which will not receive a blended water supply. <br />'Sased on full service ground-water exchange acre equivalent of the CAP area that can be served with Colora 0 <br />River water. (5.72 acre-feet per acre at canal side.) <br /> <br />derived Not all of the household items that might be <br />affected by salinity in other reports were used because <br />of lack of enough evidence that a real detrimental <br />effect occurs. The individual items used were those <br />which were judged to be important and relevant to the <br />average home in the Lower Colorado River area. The <br />damage figures used, which were judged to be <br />representative of full service areas, are given in Table 8. <br /> <br />The Lower Colorado River Basin was analyzed as th ee <br />separate areas. The areas are (1) the Municipal waler <br />District of California, (2) the Central Arizona Proj ct <br />service area, and (3) the Lower Main Stem munici, al <br />service area which includes cities along the Colorado, in <br />the Imperial Valley, and Las Vegas, Nevada, including <br />surrounding cities. <br /> <br />32 <br />