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<br />-17- <br /> <br /> <br /> <br />portion of the drainage for which credit is claimed is <br />probably the same water that contributes to the non- <br />beneficial consumptive use in the salvage area. We believe <br />that only slightly over one-half, or 8,000 acre-feet, of <br />the total surface inflow into the Basin can be considered <br />as net salvage. <br />Salvage of Ground Water <br />Although it may seem to the casual observer that the <br />water is at or near the land surface over much of the area, <br />U.S.B.R. measurements of eight selected observation wells <br />indicate that the average depth to water over the entire <br />area during the growing season is about 4.3 feet. Thus, <br />the average depth that the water table would be lowered to <br />bring it down to an average of 8 feet, as proposed by the <br />U.S.B.R., is only 3.7 feet. The amount of water that can <br />be salvaged is, other conditions being equal, the difference <br />between the natural evapotranspiration loss at 4.3 feet and <br />at 8 feet. <br />The U.S.B.R. determined potential salvage by use of a <br />method developed by the U. S. Geological Survey in Water <br />Supply Paper 659-A. Previous Geological Survey experiments <br />had demonstrated that a fluctuation in the water table is <br />directly related to evapotranspiration uses. The U.S.B.R. <br />set up a network of observation wells in areas which were <br />determined by extended observation to not be susceptible to <br />fluctuations caused by various tYpes of inflow. During the <br /> <br />GCC4i'1 <br />