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<br /> <br />-19- <br /> <br />limitation seems reasonable, since it can always be increased <br />if experience indicates the feasibility of increased sal- <br />vage. The U.S.B.R. estimate that a total of 86,500 acre- <br />feet of water could be salvaged annually by pumping from <br />the 108,600 acre salvage area. This is the equivalent of <br />approximately 0.80 acre-feet of water per acre. <br />Data obtained by the Bureau of Reclamation and the <br />Geological Survey was utilized by Woodward-Clyde-Sherard <br />and Associates in their analysis of water consumption in the <br />proposed salvage area. However, rather than using the Bureau <br />of Reclamation's "saturation illdex" to convert the net rise <br /> <br /> <br />in water table to an equivalent quantity of water, Woodward- <br />Clyde-Sherard based their estimate on the apparent specific <br />yield of the soil formation, plus a limited consideration of <br />water that may have been moved by capillary action. Water <br />consumption rates for different depths to the water table <br />suggest practically no consumption at 8 feet and about 0.67 <br />acre-feet of water per acre annually at an average depth of <br />4.3 feet. Since this 4.3 feet is art average, the water <br />table is slightly higher than this during parts of the sea- <br />son and lower during other parts. Thus, the root zone of <br />the vegetation is being "irrigated" annually to the extent <br />that capillarity and vapor pressure can move upward for <br />evapotranspiration. It seems reasonable to assume that about <br />8 1/2 inches, or 0.70 acre-feet, of water per acre could be <br />saved annually by lowering the water table to an average <br />(' '" '4" ') <br />I:;' I ! <br />, _ to", lJ ,-,; t.J <br /> <br /> <br />I <br />