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<br />USBR/MWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />W <br />'-rt . <br />CO <br />to <br /> <br />monthly TDS levels dropped significantly to a historic low of about 525 mgIL, the lowest <br />sustained salinity concentrations since the Colorado River Aqueduct was completed (se <br />Figure 2-9). This alleviated concerns about imported water salinity, until concentrations <br />returned to normal, higher, levels in the 1990s. Figure 2-10 is a bell curve, illustrating <br />variability in CRW salinity. <br /> <br />Figure 2-9 <br /> <br />Imported Water Salinity: 1940-1998 at Lake <br />Havasu and 1973-1998 at Devil Canyon Afterbay <br /> <br />800 <br /> <br /> <br />800 <br /> <br />700 <br /> <br />} '00 <br /> <br />.S !iOO <br />'" <br />CI <br />f-.' 400 <br /> <br />300 <br /> <br />100 <br /> <br />100 <br /> <br />1990-98 <br /> <br />o . 0 <br />!!!!!~!!~~~~~~~m~~~~~!~!!!~!~!~~g~~~~~~[~!!!!!~!!~~!~~~~~!g <br /> <br />CRW and SWP salinity levels increased significantly during the 1987-1992 drought. The <br />cumulative effect was that local potable systems experienced increased TDS, making it <br />difficult for reclaimed water producers and wastewater dischargers to comply with Basin Plan <br />objectives. During an extreme drought, CRA supplies could exceed 900 mgIL (a 5-percent <br />probability), as illustrated in Figure 2-11. <br /> <br />BOOKMAN-EDMONSTON Section 2 <br />ENGINEERING, INC. 2-10 Salinity Problems, Impacts, & Technology <br />O:\LOCALRES\ANDYS\SALTNITY\JUNE9B-2\6SECT2.DOC Last printed 07/20/98 10:11 AM <br /> <br />e <br /> <br /> <br /> <br /> <br /> <br /> <br />e <br /> <br />e <br />