Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />, <br />, <br /> <br />~ <br />"" <br /> <br />. <br /> <br />.:~~--,..~,_. -..-.----- . <br /> <br />- (").- ,', <br />li(;.~-'; <br /> <br />Based on the same pumping tests, the storage coefficients ranged <br /> <br /> <br />from 0.000082 to 0.179. These values are considered as minimums since <br /> <br /> <br />storage coefficients increase with time as additional water is drained <br /> <br /> <br />from the system. The average storage coefficient of the alluvium in the <br /> <br /> <br />study area was assumed to be 0.20 (Bjorklund and Brown, 1957). <br /> <br />Ground-Water Storage and Potential Storage Capacity <br /> <br />The amount of ground water in storage and the potential storage <br /> <br /> <br />capacity was calculated for the alluvium within the study area. The <br /> <br /> <br />quantities of ground water in storage reported in Table 1 come 'from <br /> <br /> <br />data provided by the USGS (unpublished report). These figures are a <br /> <br /> <br />composite of reported, estimated, and measured data. A close approxima- <br /> <br /> <br />tion of these values can be produced by estimating the aerial extent of <br /> <br /> <br />the alluvium and multiplying by the average saturated thickness. This <br /> <br /> <br />value must then be corrected for the storage capacity of the saturated <br /> <br /> <br />ma terial. <br /> <br />The values for potential ground-water storage capacities were <br /> <br /> <br />calculated similarly to actual quantities of ground water in storage. <br /> <br /> <br />The surface area of the slluvium multiplied by the average depth to water <br /> <br /> <br />multiplied by the storage coefficient (specific yield) equals the poten- <br /> <br /> <br />tial storage capacity. These values are not intended to be exact quanti- <br /> <br /> <br />ties, but only indicators of where potential storage capacity might exist. <br /> <br /> <br />Other factors resulting in reduction of capacities such as the presence <br /> <br /> <br />of clay lenses were not taken into account due to the lack of data <br /> <br /> <br />available on their occurrence. In the study area from Fort Morgan to <br /> <br /> <br />the Colorado-Nebraska state line, a potential storage capacity in excess <br /> <br /> <br />of 900,000 acre-feet was calculated. Because of the lithologic charac- <br /> <br /> <br />teristics and existing high water tables in some areas, the actual storage <br /> <br /> <br />capacity is expected to be substantially less than the potential capacity. <br />