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<br />. <br /> <br />. <br /> <br />w <br />0) <br />Ul <br />l\,) <br /> <br />Kleinman and Brown (Reference 6) did a detailed household study <br />and extended it to the entire Colorado River potable service area. They <br />constructed "typical" households for the Los Angeles-Long Beach, Central <br />Arizona, and Lower Main Stem service areas, making allowance for the <br />different TDS concentrations reaching homes in the three areas. Their <br />most likely estimates are given in Table 1II-6 below. <br /> <br />TABLE 1II-6. ANNUAL SALINITY DAMAGES <br />FOR RESIDENTIAL USERS <br />($ 1980/mg/l)14 <br /> <br />Metropolitan Water District of <br />Southern California <br />Central Arizona <br />Lower Main Stem <br /> <br />TOTAL <br /> <br />$250,580 <br />35,242 <br />36,448 <br /> <br />$322,270 <br /> <br />Total damages. Here, the earlier agricultural results and the <br />residential damages just presented are summarized. The annual residen- <br />tial loss per mg/l translates into $32.23 per short ton of salt per year. <br />If we add that figure to the U,S. agriculturally-related damages of <br />Table 1II-5, we get the following total cost data (Table 1II-7), <br /> <br />Kleinman and Brown analyzed the values of Table 111-7 to estab- <br />lish the total salinity damages (benefits) that would accrue from (a) a <br />salinity level of 1,225 mg/l (the WPRS' best estimate of salinity at <br />full development with no mitigation measures employed) and (b) a salin- <br />ity control program that would keep a salinity level of 875 mg/l. This <br />calculation was made by calculating the area under the curve plotted <br />with dollars of damages vs. TDS in mg/l in the relative range of 875 mg/l <br />to 1,225 mg/l. Using a linear least squares fit to approximate the <br />curve between these levels, Kleinman and Brown calculated a total bene- <br />fit in $ 1976/mg/l of $343,000.15 The WPRS has selected a derivation <br />benefit figure in current (1980) dollars of $450,000 mg/l. <br /> <br />Water opportunity costs, The various technologies available for <br />reducing salinity also affect the volume of water returned to the river <br /> <br />14 <br />Using a price factor of 1.34 to update 1976 prices. <br /> <br />15 <br />Kleinman and Brown, op. cit" p. 33. <br /> <br />II 1-11 <br /> <br />,J <br />