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<br />,. OULJj <br /> <br />their true value lies in the storage capacity they provide for <br />regulation of the overall supply. It appears that this storage <br />capacity may be on the order of 300 million acre-feet for the <br />l1hole State. <br />We are actively engaged in programs to assure that <br />our ground water basins are operated conjunctively with surface <br />supplies to provide the most efficient total system. The State <br />Department of Water Resources has recently developed techniques <br />by which it is possible to formulate a mathematical model of a <br />given basin and to sinilllate the operation of the basin storage <br />capacity for optimum benefit. These techniques are being applied <br />to studies of oasins underlying the Southern California Coastal <br />Plain now' in anticipation of planned conjunctive operations when <br />our State Water Project starts to deliver water there in 1971-72. <br />Artificial ground water recharge has been practiced in <br />some parts of Southern California for a half century or longer. <br />California artificially recharges more water underground than <br />all other states combined. At the present time some 25 agencies <br />have facilities capable of recharging approximately 400,000 acre- <br />feet per year. It will be necessary to enlarge this capacity <br />substantially in the future, and the state and Federal Governments <br />are cooperating on an intensive program of research to make this <br />economically possible. Unfortunately, time is not available to <br />pursue this subject further today. <br />California has about 33 million acre-feet of gross <br />storage capacity in surface reservoirs. By far the most important <br /> <br />-7- <br />