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<br />w <br />OJ <br />Ul <br />~ <br /> <br />[I~- <br />'i\(} I <br />,'"Y'I^{I," <br />"I" <br /> <br />. <br /> <br />. <br /> <br />system for downstream use. Some technologies increase consumptive use <br />while others don't affect or even reduce consumptive use. The economic <br />evaluation of each technology must appropriately charge or credit it with <br />the value of that changed consumptive use. <br /> <br />Water that is saved or consumed at the margin of use in the Up- <br />per Basin will be used by or taken from agriculture in the Lower Basin. <br />In particular, since California currently uses considerably more than <br />its entitlement under the 1963 Supreme Court Decree, the change can be <br />expected to affect California areas primarily. Table 111-8, using data <br />taken from the Andersen-Kleinman report, provides an estimate of this <br />opportunity cost (marginal value) of water. <br /> <br />TABLE III-8. MARGINAL AGRICULTURAL VALUES OF WATER <br />IN THE CALIFORNIA SERVICE AREA (1978 STUDY) <br /> <br />Number of <br />Acre-Feet <br /> <br />Net Return/ <br />Acre-Foot <br /> <br />Imperial Irrigation District <br />Coachella Irrigation District <br />Palo Verde Irrigation District <br />Colorado River Indian Reservation <br />California Coastal Region <br /> <br />TOTAL AND WEIGHTED AVERAGE <br /> <br />2,692,000 <br /> <br />/ i~~:g~J ? <br />'--"----- <br />369,000 <br />129,000 <br /> <br />3,875,000 <br /> <br />$ 31. 00 <br />43.00 <br />46.00 <br />46.00 <br />176.00 <br />$ 40.00 <br /> <br />Agricultural damages in Mexico, The total damages shown in the <br />previous sections cover only damages within the United States. For pur- <br />poses of comparing benefits and costs of a program of financial incen- <br />tives to reuse, it is appropriate to consider U,S. benefits and costs <br />only. However, a program that would reduce Colorado River salinity <br />within the U.S. also would reduce salinity in Mexico and result in ad- <br />ditional benefits to Mexican agriculture. This section describes these <br />extraneous benefits which supplement and reinforce the consequences of <br />a U.S. salinity control program. <br /> <br />It should be noted that any reduction in salinity in the Lower <br />Colorado River Main Stem, as measured at Imperial Dam, will not affect <br />the need for the proposed Yuma Desalting Plant, to be constructed and <br />operated by the U.S, Water and Power Resources Service. The purpose of <br />that plant is to partially desalt water in the Colorado River just be- <br />fore it enters Mexico, to compensate for highly saline water flowing <br />from the Wellton-Mohaw~~Canal, The Yuma plant is intended to operate to <br />-nfa~ntain-the-avera:ge -annual salinity of water entering Mexico at a level <br />no greater than 115 ~ 30 ppm above that at Imperial Dam (see p. II-I). <br /> <br />III-13 <br /> <br />~ <br />