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<br />lH' ~ e; 111 <br />',~, _,. - -' '<io.< I <br /> <br />49 <br /> <br />or they pump additional groundwater into the river or directly into <br />canals: affected by pumping. <br />While this solution is working reasonably well, there are many <br />surface water right owners who still claim inequity and many lawsuits, <br />pending over alleged injury to surface water supply by groundwater <br />pumping. <br />T~us, the ingenuity of water users combined with technology devel- <br />oped a,<t Colorado State University produced the first step toward volun- <br />tary basinwide management of the surface-groundwater resources. Although <br />this was a large step, it is only the first toward full conjunctive <br />operatflon of the two sources of supply. <br />While an augmentation plan is a sound basis for conjunctive manage- <br />ment of the surface-groundwater system, other technological developments <br />are yet needed. In particular, efficient recharge facilities are needed! <br />to supplement recharge now occurring by canal and reservoir seepage and <br />deep percolation from irrigation. New facilities should be located to. <br />maximize the effectiveness of plans of augmentation taking into account <br />the tijning and location of return flow. While several recharge sites <br />have bj!en placed in operation during recent years, the total volume of <br />artificial recharge is still small. <br />Groundwater recharge during the period of high spring runoff must · <br />be greatly increased if the full potentialities of conjunctive use are' <br />to be ,realized. Comprehens ive recharge investigations shoul d be a high <br />priority for both surface and groundwater right owners. <br />The extent to which recharge strategy can substitute for upstream <br />surface reservoir storage cannot be evaluated without such investiga- <br />tions. However. the possibility exists that a recharge system can <br />reduce! the need for some upstream storage. Use of the groundwater <br /> <br />;L <br /> <br />" --'~ -;" .. . , <br /> <br />~, ,.4L:,~, _~;",tbk;'~; t <br />