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<br />USBRIMWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />. <br /> <br />As demand increases in future years, Metropolitan will need to use more SWP water which <br />inherently lowers system TDS levels as it mixes with the full flow of the CRA. However, , <br />TDS is expected to concurrently increase in Lake Havasu and the CRA in response to <br />additional agricultural and urban development upstream in the Colorado River Basin. Even <br />with the benefit of the Colorado River Salinity Control Program, average IDS in the CRA is <br />forecasted to approach the established criterion of 747 mgIL by about 2015. Given these two <br />opposing phenomena, average annual IDS in Metropolitans system is expected to increase <br />through 2008 and then decline as illustrated in Figure 3-5. This represents "baseline" <br />conditions in which SWP water use is limited to only that amount needed to meet demands, <br />and additional SWP water is not imported specifically for blending. <br /> <br />w <br />en <br />~.~ <br />.0:. <br /> <br />Figure 3-5 <br /> <br />. <br /> <br />Average Projected TDS . Blended Area <br />In <br /> 800. <br /> CRA <br /> -- ---------------- <br /> 700 -- <br /> --- Baseline*{January.December) <br /> --------- <br /> --- --- <br /> 800. --- ----- <br /> - <br /> Baseline. (April-September) <br /> 500 <br />::i <br />r 400 <br />(I) <br />f: SWP~East Branch <br /> 300. <br /> ------------------------------------------- <br /> 200 <br /> 100 1< Applies to Weymouth, Skinner and <br /> Diemer Plants <br /> 0 <br /> 1997 2005 2015 <br /> <br />VARIABILITY IN IMPORTED WATER QUALITY <br /> <br />Salinity concentrations in SWP and CRA water vary primarily as a result of hydrologic <br />conditions. During droughts the salinity concentrations increase significantly. The amount of <br />SWP water needed to blend down CRA water also changes significantly as illustrated in the <br />following three graphs (Figure 3-6). <br /> <br />. <br /> <br />BOOKMAN-EDMONSTON <br />ENGINEERING, INC. 3-9 <br />O:\LOCALRESIANDYSISAlIN/7Y\JUNE98-2\7SECT3,DOC 07120/9810:59 AM <br /> <br />Section 3 <br />Evaluation of Potential Regional <br />Salinity Management Strategies <br /> <br /> <br /> <br /> <br /> <br /> <br />. <br /> <br />;~.b;.4 <br /> <br />.. . <br />