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<br />Bookman-Edmonston Engineering, Inc. was retained by the Water and <br />Power Resources Servi ce in 1975 to gather data on i rri gat ion effi- <br />ciency and agricultural drainage in the Palo Verde Irrigation <br />District, and to make a preliminary analysis of whether water systems <br />improvements might reduce salt loading of the Colorado River from <br />irrigation. Using primarily operational data from 1974, Bookman- <br />Edmonston made an independent analysis of irrigation and drainage in <br />the District. [2] It was concluded that the river water diverted by <br />the District contained 945,000 tons of salt, and that measured return <br />flows to the river plus net subsurface outflow to the river contained <br />1,097,000 tons of salt. The difference of 152,000 tons was the net <br />salt discharge. The 152,000-ton estimate consists of a net surface <br />di scharge to the ri ver of 126,000 tons, whi ch agrees well wi th the <br />ISSP data for 1974, plus a net subsurface discharge to the river of <br />26,000 tons. <br /> <br />Discharge By Subarea <br />Bookman-Edmonston divided the irrigated flood plain land of the <br />District into 7 subareas and made a water and salt budget analysis for <br />each. The effect of i rri gat i on on the Palo Verde Mesa was also con- <br />sidered. The subareas are shown on Map 1224-300-164, and the net salt <br />discharge of each was estimated to be: <br /> <br />Subarea <br /> <br />Salt <br />Discharge <br />(tons) <br /> <br />144,000 <br />43,000 <br />35,000 <br />22,000 <br />13,000 <br />-22,000 <br />-57,000 <br /> <br />Palo Verde <br />Rannells <br />South End <br />Lower Borrow Pit <br />West Side <br />Centra 1 <br />East Side <br /> <br />Subtotal for Flood Plain 178,000 <br /> <br />" '-'''R-'~ <br />; I I ' ~ ,I ~ \ ". <br />......' \...ilw~ v~ <br /> <br />Palo Verde Mesa <br /> <br />-26,000 <br />152,000 <br /> <br />Total For District <br /> <br />12 <br />