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<br />mOBt. Improved farm irrigation efficiency is there-
<br />fore not a ~ater-98vtng remedy for a severe water
<br />drought condition a9 experienced in 1952, 1954. 1955.
<br />1957. etc.
<br />
<br />Merit of PumpinK as needed
<br />Under this strategy the river flow out of state
<br />is further reduced to around 50 percent of histori-
<br />cal. The steady application, 6tarting In 1952. of
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<br />this pumping strategy leads promptly to a new equili-
<br />brium between the stream and the aquifer, apparently
<br />in a couple of years. In other words, the strategy
<br />does not result In a continued mining of the aquifer
<br />
<br />but rather in a new equilibrium.
<br />
<br />It is fortunate
<br />
<br />that a lO-year horizon was ~hogen for this study be-
<br />cause the fears of a continuous d~cllne in aquifer
<br />storage with time as a result of a pumping as needed
<br />strategy appear now unfounded. This ia a very signi-
<br />ficant result with important management implications.
<br />With this strategy. satisfaction of irrigation
<br />requirement is drastically improved as compared to
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<br />the previous strategies even during periods of se-
<br />vere drought. The irrigation ~a(er requirements weT
<br />fully met through most of every irrigation season wi
<br />with only a few exceptions occurring during periods
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<br />SfRIES 4-. PIMP TO CAPACiTY
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<br />IRl'IlGATION S[ASON.wrEK
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<br />of very high evapotranspiration. Lining of canals
<br />and increased farm efficiency are only relative
<br />remedies because the extra amount of available ~alet
<br />is proportional to surfacewpplies. If supply is
<br />small. che water saving is also smaLL. A atrate8Y
<br />of pumping as needed 19 an absolute remedy, Except
<br />fo. pump capacity limitation. water 18 made avai18b~
<br />as needed, where and when needed.
<br />
<br />Merit of Combined Improvements
<br />Downst.eam flows out of state in the riyer are
<br />further reduced to about )0 percent of historic and
<br />
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