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<br />~" '":\ <br />. J" <br /> <br />. - :",;1 <br /> <br />, .,' )" " <br />'" . :,; <br />,. "., i <br />ur ..;j/ <br /> <br />I .' <br /> <br />thickness were added to Figure 12 for clarity. The contour maps were <br />checked against the parent maps for accuracy and any erroneous values in the <br />arrays were corrected. <br /> <br />Using the computer, elevations of the base of each aquifer were <br />compared to the elevations of the top of the aquifer to insure that the base <br />of the aquifer was indeed lower than the top.. The thicknesses of the water <br />yielding materials were compared to the total aquifer thicknesses to insure <br />that the thicknesses of the water yielding materials did not exceed total <br />aquifer thicknesses. The last mentioned test caused the thickness of water <br />yielding materials array for the Upper Dawson to be discarded as some of the <br />sand intervals originally mapped were above the water table. Some <br />discrepancies in the remaining aquifers were found requiring adjustments to <br />values in the arrays and in some instances corrections to the parent map. <br /> <br />The average aquifer thickness, the average thickness of water yielding <br />materials and the average thickness of water yielding materials to total <br />aquifer thickness ratio were computed for, each aquifer except the Upper <br />Dawson. The results are shown in Table 1. An average thickness of water <br />yielding materials to total aquifer thickness ratio of 0.5 \t~--ea-lett-lated <br />for the Upper Dawson from a study of geophysical logs. . <br /> <br />Table 1. Aquifer Statistics -- Average aquifer thicknesses (m), average <br />thicknesses of water yielding materials (n), and average thickness of water <br />yielding materials to aquifer thickness ratios (n/m). <br /> <br /> Area Area Area <br /> In Averaged n Averaged Averaged <br />Aquifer (feet) (Sq. Mi.) (feet) (Sq. Mi.) nlm (Sq..~li.) <br />Laramie-Fox Hills 286 5405 175 5560 .6473 5317 <br />Lower Arapahoe 222 1194 91 1062 .4149 1060 <br />Upper Arapahoe 408 3522 172 4053 .4738 3461 <br />Denver 804 1469 207 3127 .3695 1467 <br />Lower Dawson 235 696 97 654 .4426" '. 654 <br /> / <br /> <br />Before the data could be used in the models, additional adjustments <br />were required as follows: <br /> <br />1. Where aquifers were confined the potentiometric surfaces were <br />changed to correspond to the elevations of the top of the aquifers. <br /> <br />-10- <br />