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EBMUD and the Contra Costa Water District (CCWD) are evaluating the possibility <br />Of EBMUD supplying "surplus" water to the CCWD. In this event, EB:~'JD would <br />probably divert its full contractual amount of water (150,DOD AFA) from the <br />American River every year. <br /> <br />IMPACT OF EBMUD'S DIVERSION ON FLOW IN THE LOWER AMERICAN RIVER <br /> <br />EBMUD's proposed diversion will have minor effect on the flow in the lower <br />American River. The reduction in flow will depend on the quantity and <br />frequency of the diversion by EBMUD. <br /> <br />The Board conducted hydrology studies to determine the effect that EBMUD's <br />proposed diversion would have on the flow in the lower American River. A wi~ <br />range of alternatives were evaluated. The alternatives are base~ on criteria <br />used by the Bureau for the operation of Folsom Reservoir, 57 years of <br />streamflow records, various instream flow criteria, and the diversion of <br />different quantities of water through the Folsom-South Canal. The results <br />the Board's studies indicate the following. <br /> <br /> . The construction of Folsom Dam (and other upstream dams) has <br /> substantially altered the flov~ in the lower A~rican River. Puture <br /> development will continue to alter the flow in the river. Figure 2 <br /> below shows the flow for the natural, present and future conditions. <br /> <br /> . ~he ~peration Df Fol~om Reservoir by the Bureau t~ the prima~ facto~ <br /> that control ~ the level ~f flow in the lower A~rican River, particu- <br /> larly during the low-flow period (July through September). Currently, <br /> the Bureau operates Fol$om Reservoir to provide a mini~m flow of <br /> cubic feet per ~econd (cf~) between )timbus Dam and Howe Avenue (i.e., <br /> "modified" D-140D flow ~tandards). In the future, the Bureau may divert <br /> <br /> 8 <br /> <br /> <br />