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<br />.0 U 12 J U <br /> <br />- 2 - <br /> <br />and not be totally lost. <br />h portion of the 50.5 million acre-feet not ~ppearing a~ <br />surface runoff is utilize~ ~encficially by nature as it provides <br />moisture for the ~rowth of qrass on our ranaeland. <br />Not only is our surface water sup~ly of limited quantity but <br />also it is mal-distributed. About 70 percent of the annual runoff <br />occurs between hpril and June and periods of drou~ht may range <br />from 2 to 20 years. Further, the distribution of runoff is rel- <br />atively favorable for the areas tributary to the streams draining <br />the Sierras, the Central and Eastern parts of Nevada, the Upper <br />Humboldt River, and the Snake River drainage in the northeast <br />part of the State. But for large parts of Northwestern or Southern <br />Nevada, runoff is very small and erratic. <br />Ground water is somewhat more favorably distributed geographically <br />in Nevada than are surface water supplies. ~owever, there are <br />some areas, particularly in the south-central or southern part of <br />the State; where ground water is at too areat a depth for economic <br />recovery for many present day uses. In other areas, the depth of <br /> <br /> <br />water may not be too great but the cost of development may be <br /> <br /> <br />high for other reasons in the present day economy. <br /> <br /> <br />Within Nevada, there are over 100 valleys, some quite large <br /> <br /> <br />and others small, but all containing ground water in storage. <br /> <br /> <br />It has been estimated by the USGS that within these valleys there <br /> <br /> <br />is at least 200 million acre-feet of ground water in storage in <br /> <br /> <br />the upper 100 feet of saturated gravels. <br /> <br /> <br />The Nevada Ground-Water Act attempts to limit annual withdrawal <br /> <br /> <br />to the average annual recharge. It has been estimated by the <br />