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<br />USBRIMWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />. <br /> <br />Figure 2-4 <br /> <br />W <br />~)1 <br />CO <br />,p.. <br /> <br />Salt Balance in Southern California Coastal Plain <br /> <br />Inflow Exceeds Outflow <br /> <br />3.5 <br /> <br />3 <br /> <br /> <br /> <br />.118,,,'81 ' <br /> <br />s'ormfIOw~ <br /> <br />-e2,S <br />~ <br />6 2- <br />~ <br />.. <br />~ <br />~ 1.5 <br />!. <br />1i 1 <br />"' <br /> <br />0.5 <br /> <br />o <br /> <br />Inflow <br /> <br />Outflow <br /> <br />. <br /> <br />BACKGROUND AND HISTORY <br /> <br />Salinity has been a concern of water resource managers in Southern California for most of the <br />20th century. Agricultural activities since the 1880s have increased IDS in many <br />groundwater basins. Some areas have relied upon imported water to blend down high TDS <br />levels in their groundwater supply (see Figure 2-5, and Table 2-2). <br /> <br />During the 1950s and 1960s, over 2 million acre-feet of Colorado River Water (CRW) was <br />spread in the Santa Ana and San Gabriel Rivers to alleviate severe groundwater overdraft. In <br />addition, seawater barriers were constructed and placed into operation to prevent further <br />seawater intrusion. Over one million acre-feet of imported water has been injected into <br />barriers in the Central and West Coast Basins. With an average IDS of 700 mgfL, the CRW <br />contributed salts to the groundwater. <br /> <br />. <br /> <br />BOOKMAN-EDMONSTON Section 2 <br /> <br />ENGINEERING, INC. 2-5 Salinity Problems, Impacts, & Technology <br />O:\LOCALRES\ANDYS\SALINITY\JUNE98-2\6SECTI.DOC Last printed 07120/98 10: 17 AM <br /> <br /> <br /> <br /> <br /> <br /> <br />" ,_.,,:'~, <br />