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<br />I, <br /> <br />(; 11 G J <br /> <br />Disadvantages of ground-water storage when compared to surface storage <br />include the need for energy to pump the water'out of the ground, and <br />the possibility of waterlogging adjacent lands where the water levels <br />are near the surface. Most important from a water-management view is <br />the contrast in responsiveness between the ground-water reservoir <br />and the surface reservoir in terms of meeting critical demands. For <br />delivery purposes, surface storage is i~~ntaneouS1Y available and <br />the delivery rates can be directly ~o~,'t~1~~~ by man. The yield from <br />\: "" '\.....,~ <br />ground-water storage is limited:ti;'~~e'~~e of ground-water transfer <br />(>-. ) <br />\ . , '.I <br />within the aquifer. Altho~9h, groun9~water storage may not be affected <br />. '~ <br />by short droughts, wel~~aY'be ~}ied up because the well is too <br />/,,', \ " .- <br /><"", '"/ <br />shallow or becaus"(ldeai',~ll!\lPing draws down water levels excessively. <br />~~~ <br /> <br />~ Geology <br /> <br />In the study area, which lies generally east and'north of Fort Morgan, <br />Colorado, the South Platte River Valley is composed of sedimentary <br />rocks and deposits ranging in age from Late Cretaceous to Recent. The <br /> <br />geology of this area has been described by Bjorklund and Brown (1957). <br />Stratigraphically, from oldest to youngest, the formations and deposits <br />of interest are the Pierre Shale, Chadron Formation, Brule Formation, <br />Ogallala Formation, alluvium, and the surficial deposits of dune sands <br />and loess. <br /> <br />The youngests deposits of the area, from Pleistocene to Recent age, <br /> <br /> <br />consists of alluvium deposited in the South Platte Rivery Valley and <br />