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s 0742 <br />The State has acquired sufficient shares in the Catlin Canal to <br />..r�r <br />maintain a permanent pool under the above assumptions. During the 25- <br />year period, the average volume of the permanent pool is 10,900 acre- <br />feet (1.3x10 m The initial volume of the pool is 10,000 acre -feet <br />(1.2x10 m <br />The change in water use increased the mean annual .surface -water <br />diversion of 18 of the 21 canals in the area having surface -water rights. <br />The remaining three canals are not affected. The total increase in <br />surface -water diversion is 1,770 acre -feet (2.2x10 m Three canals <br />have small decreases in surface -water diversion during some months due <br />to the change in water use plan. This decrease primarily happened <br />during the early spring, but also occurred in the late summer. <br />• The flow at the State line increased an average of 30 acre -feet <br />� <br />(3.7x10 • m 3 ) per month due to the change plan. This increase in flow is <br />accompanied by a slight increase in the variability of flow at the State <br />line. <br />The difference between ground -water storage change under normal <br />operation simulation and the simulation with the change in use is <br />insignificant. <br />The overall benefit to the water users in the basin is due to <br />several factors. The most significant factor is a decrease in the <br />charge in evaporation losses from the nonpermanent pool in John Martin <br />Reservoir because of the permanent pool. A less significant factor is <br />the change in timing of return flows from water that had been histor- <br />ically applied, but was not transferred. The 2.5- percent river loss <br />charge also adds some water to the system. <br />24 <br />