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<br />have been in use for some years at a point a few miles <br />below the upper end of the Saiz Levee, and show about <br />the same drawdown. Another large well was drilled near <br />the head of Pescadero Cut and gave fine results on test, <br />but has never been put'to continuous use. The extent of <br />the underground bash!. ha.s never been determined, but it <br />is believed it covers as much as 200,000 acres and it is <br />not improbable that it could produce, by proper develop- <br />ment, a considerable quantity of water for several years <br />at a time, during occasional periods of low flow in the <br />River. <br /> <br />This is a resource which, it is believed, should be <br />thoroughly explored and studied. It is available to <br />Mexico, and should be considered as a part of the supply <br />for irrigation use in Mexico. Many areas in the United <br />States now and in the future will have to depend upon <br />utilizing similar lmderground sources to supplement sur- <br />face flow. R:;;:a.mplcs are, the Coachella Valley in <br />California, which will havo to supplement the water it <br />receives from the All-Arnerican Canal by pumping from its <br />underlying basin and the Salt River Valley in Arizona, <br />where the use of underground water in large amounts has <br />been necessary to preserve development of the Valley.. <br />other examples are tho lower Gila Valley in Arizona and <br />Owens Valley in California. In view of these conditions, <br /> <br />- 22 - <br />