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<br />ANNUAL POTENTIAL <br />EVAPORATION (inches) <br /> <br />..... <br />+- <br /> <br /> <br />AVERAGE ANNUAL PRECIPITATION <br /> <br />~ <br />E3 <br />c;:;::J <br /> <br />< 10 inches <br />< 20 inches <br />> 20 inches <br /> <br />COLORADO RIVeR <br /> <br />l-7 Mean annual precipitation and potential evaporation in the Grand <br />River Basin (after Iorns, Hembree, and Oakland, 1965). <br /> <br />- <br /> <br />~ ---- <br /> <br />"-'~~.-..~,. <br /> <br />9?Tt <br />