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<br />00;)755 <br /> <br />necessarily mean that 40% of the water delivered to this field is lost to the system. It means that only 60% of <br />the water diverted from the source and applied to the field is stored in the root zone or used beneficially to <br />satisfy crop requirements, The other 40% may reiurn to the stream or ground water and become available for <br />another user, Thus, in river basins, irrigation efficiencies of individual fields may be low, but the overall <br />water use efficiency of the basin can be high, <br />The efficiency of various irrigation practices is also important where water is pumped from deep ground <br />water aquifers, but different factors must be considered, In these systems inefficient irrigation results in <br />substantial water loss to the aquifer because the time it takes the deep percolated return flows to reach the <br />ground water aquifer is too long for this water to be considered reusable, In addition, the energy needed to <br />pump the additional water can represent a significant cost to the overall production system. <br /> <br />12 <br />