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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />~ <br />-J <br />en <br /> <br />-52- <br /> <br />due to salinity increase in the Los Angeles area have been <br /> <br /> <br />reported by Eubanks and d'Arge (l976), Lawrence (1975), and <br /> <br /> <br />Tihansky (l974). <br /> <br /> <br />Agricultural costs can be measured by crop yield <br />reduction, high leaching requirements which often neces- <br />sitate costly subsurface drainage systems, special tillage <br />practices and higher labor costs (Anderson and Kleinman, <br />1978, Robinson et al., 1976: and Moore et al., 1974). The <br />soils and soil structure also can be severely damaged by <br />excess salinity requiring many years to be reclaimed. Moore <br />(1972) presents an interesting discourse on the necessary <br />and sufficient conditions for long-term agriculture, pri- <br />marily related to salinity. Moore et al. (1974b) have <br />developed crop production functions relating quality and <br />supply of water in the Colorado River Basin. Kleinman et al. <br />(l974) and Kleinman and Brown (1977) discuss the damages to <br />agricultural production by salinity in the UCRB. <br />The Soil conservation estimates the total municipal <br />damages in the Lower Colorado River Basin change at an <br />annual rate of $291,200 per mg/l change in salt concentra- <br />tion. Agricultural damages increase $124,800 annually per <br />mg/l (USDA, SCS, 1979b). <br />The USDI, WPRS (1980a) is presently using a total <br />annual damage figure of $447,700 per mg/l increase at <br />Imperial Dam (January 1, 1980 prices) for the range of <br />concentrations expected in the next 20 years (825-1225 <br />mg/l). These damage values do not consider costs passed <br />