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<br />I ~:~ ') fJ 'l:l <br />IJ '. . _' .'_'.' I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />-'.i <br />~,-, <br /> <br />Headwaters of the Box Elder basin (Hunning Creek) originate <br /> <br /> <br />ih the extreme southwestern portion of Elbert County. <br /> <br />The alluvial deposits in Box Elder Creek valley range from 1 <br /> <br /> <br />to 3.5 miles in width. In the deepest part of the valley, <br /> <br /> <br />deposits extend to a thickness of 85 feet. <br /> <br />B~cause of the relatively larger proportion of clay and silt in <br /> <br /> <br />t~e Box Elder valley deposits, coefficients of permeability and <br /> <br />t~ansmissivity are lower than those of the South Platte River <br /> <br /> <br />valley. well yields are commensurately smaller, with a yield <br /> <br /> <br />o~ the order of 1,100 gpm considered a maximum condition. <br /> <br /> <br />This compares to yields which range up to 2,000 gpm in areas <br /> <br /> <br />of the main-stem South Platte valley. Recharge of the Box <br /> <br /> <br />Elder Creek drainage is attributable to native creek flows, <br /> <br /> <br />p~ecipitation, seepage from ditches and reservoirs, and <br /> <br />returns from irrigated land. <br /> <br />LdsT CREEK (PROSPECT VALLEY) <br /> <br />The principal aquifer of the Prospect Valley area is the <br /> <br /> <br />aI'luvium of Lost Creek, a tributary which flows in a northerly <br /> <br /> <br />diTeotion to the South Platte. The width of the aquifer ranges <br /> <br /> <br />from 1 to 5 miles, with a thickness approaching 200 feet. <br /> <br /> <br />A Tange of yields from 200 to 1,400 gpm.is typical of irrigation <br /> <br /> <br />weRls in the area. Specific capacity averages 63 gpm per foot <br /> <br /> <br />of. drawdown, with the range varying from 165 to 13 gpm/ft. <br /> <br />2-12 <br /> <br /> <br />..L ;l <br /> <br />k <br />