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<br />USBRlMWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />\ <br /> <br />Figure3-9 <br /> <br />e <br /> <br />w <br />CJ) <br />~.... <br />W <br /> <br />"', <br /> <br /> <br />Benefits of Achieving a 500mg/L Target <br /> <br /> 100 <br /> 80 <br />. 80- <br />~ <br />iii <br />.. 40- <br /> 20- <br /> 0 <br /> <br /> <br /> <br /> <br />6-month <br /> <br />9-month <br />Blending Pariod (Year 2000) <br /> <br />12-month <br /> <br /> <br />Benefits are for reduction in salinity of blended area compared to baseline condition <br /> <br />e <br /> <br />EASTSIDE RESERVOIR STORAGE AND CYCLING OF SWP SUPPLIES <br /> <br />Metropolitan could draw down its reservoirs every summer and refill them in the winter when <br />there is a generally surplus flow of low salinity water in the Delta. The ability to cycle stored <br />supplies will greatly increase upon completion of the Eastside Reservoir and the Inland <br />Feeder. There are risks associated with cycling, including inability to refill the drafted storage <br />because of drought conditions, or because of Delta fish-take constraints, or other operational <br />limitations. Comparable operations could be conducted with groundwater replenishment <br />deliveries. <br /> <br /> <br />Lake Perris water will be needed at times to achieve summer salinity targets at the Skinner <br />filtration plant. However since the reservoir is subject to nearly six feet of evaporation <br />annually, salinity tends to build up in Lake Perris when water is not exchanged by cycling (see <br />Figure 3-10). For example, February 1998 salinity levels in Lake Perris were about 330mglL <br />while the East Branch of the SWP was providing 200 mg/L water. Achieving low salinity <br />levels in Lake Perris is constrained by: <br /> <br />e <br /> <br />BOOKMAN-EDMONSTON <br />ENGINEERING, INC. 3-14 <br /> <br />O:\lOCAlRESIANDYSISAlINITYWUNE98-3\7SECT3.DOC 08l1Sffi8 9:40 AM <br /> <br />Section 3 <br />Evaluation of Potential Regional <br />Salinity Management Strategies <br /> <br />.. <br />