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<br />. <br /> <br />. <br /> <br />-l:. <br />t' <br /> <br />. <br /> <br />.. t'"'. ~-) <br />l'C/t: <br /> <br />method could be used to recharge the water. If soils of low permeability <br /> <br />blanket the surface or if zones of impervious material exist below the <br /> <br />surface, infiltration rates will be lowered. Any proposal for a specific <br /> <br />recharge system should be based on actual test results of the specific <br /> <br />area to be recharged. <br /> <br />Other factors that should be given consideration in the selection <br /> <br />of a recharge method are: climate, topography, aquifer permeabilities, <br /> <br />land acquisition, cost, energy requirements, environmental impact, and <br /> <br />effects on water rights. <br /> <br />GEOLOGY <br /> <br />In the study area, which lies generally east and north of Fort Morgan, <br /> <br />Colorado, the South Platte River Valley is'composed of sedimentary rocks and <br /> <br />deposits ranging in age from Late Cretaceous to Recent. The geology of this <br /> <br />area has been described by Bjorklund and Brown (1957). Stratigraphically, <br /> <br />from oldest to youngest, the formations and deposits of interest are the <br /> <br />Pierre shale, Chadron formation, Brule formation, Ogallala formation, alluvium <br /> <br />and the surficial deposits of dune sand and loess. <br /> <br />The oldest formation of interest is the Pierre shale of Late Cretaceous <br /> <br />age which directly underlies the alluvial deposits from the beginning of <br /> <br />the study area to about Proctor, Colorado. This formation consists of bluish- <br /> <br />black marine shale and silt with interbedded sand and sandy shale. Thickness 01 <br /> <br />the Pierre ranges from about 6500 feet near Hardin, Colorado, to about 2500 feE <br /> <br />near Paxton, Nebraska. <br />