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<br />O".}(\<) <br />\J.lwJC <br /> <br />,. <br /> <br />.I <br /> <br />GRO\JlID-WATER RESOURCES--DEVELOPMENT AND MANAGEMENTlI <br /> <br />By" <br />C~e S. ConoyerY <br /> <br />" <br /> <br />The need for broader appreciation. evaluation. am management <br />of our ground-water resources is becolll1ng more evident ever,y da;y. <br />Uso. as develDplll8nt of our water resources approaches a finite lbI1.t, <br />it becomes evident that ground watel'll and surface waters must be <br />developed and lIl8llaged as one water supply. This integration, like the <br />solution of ma/:lY other problems. is easier said than done. <br /> <br />Effective develolDant am Dl8nagelllent of ground water. whether <br />singly or in conjunction with surface water. requires knowLedge and <br />appreciation of its physical envirollDlent. Though ground water and <br />surface water are phllSes of the hydrologic cycle and therefore are <br />1nterdependent, their priJDe cOl1llnon denominator is the fact that both <br />are wet. There are other cO)TJ/l1on factors. of course. such as Chemical <br />character, but m~ of the physical situations in wh1ch ground water <br />and surface water exist <ire quite different. It is only because they <br />are different that we have water during dr,y periods. Mother nature <br />planned it this way, and if man 1s to make max1mum use of ground and <br />surface watere he must ~ understand and tailor his actions to take <br />advantage of these different environmental factors. <br /> <br />, . <br />., <br /> <br />Take storage, for eX8lllple. In 1Il0st areas, the volume of ground <br />water in storage 1s several times that of surface water. In the <br />UlIited States IlS a whole, the quantity of water in underground storage, <br />witbin half a DIlle of the land surface. is several tiJDea that in all <br />the large lakes of the North American Continent and IllOre than 100 <br />times the annual. runoff of streams in the United States (Nace, 1960, p. 3). <br />Thoug/l the volume of ground water in storage is large, its natural rate <br />of replenishment 1s mall in comparison. For the United States as a <br /> <br />1/ Presented August 24, 1960, to Groun:i Water Section of t.he West.ern <br />Reaources Conference, Boulder, Colo. Publication authorized by the <br />Director. U. S. GeolOgical Survey. <br />2/ Assistant Chief, Ground Water Branch. Wat.er Resources Division. <br />ii. S. Geological Survey. Washington, D. C. <br />