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<br />. <br /> <br />9ll.E <br /> <br /> <br />ANNUAL POTENTIAL <br />EVAPORATION (inches) <br /> <br />AVERAGE ANNUAL PRECIPITATION <br /> <br />'.;>d < 10 inches <br />E3 < 20 inches <br /> <br />... <br />... <br /> <br />Figure 1.Sb. Mean annual precipitation and potential evaporation in the Grand River Basin <br />, (after IOD1S, Hembree and Oakland, 1965). <br />