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<br />fl"fi ':, "'~ 1 <br />v -,,);,,~ ~ ... <br /> <br />. <br /> <br />Hydrology <br /> <br />19-year study period,1947-1965. As a <br />St. Vrain Creek basin averaged 30,200 <br />longer and continuous period of time, <br />average 49,500 acre-feet annually. <br /> <br />result, C-BT deliveries to the <br />acre-feet per year. Over a <br />deliveries are expected to <br /> <br />Surface water supply for the service area of the basin averaged <br />287,800 acre-feet annually during the 19-year study period. The supply <br />was divided nearly equally between the St. Vrain Creek and Boulder <br />Creek areas with St. Vrain Creek inflow averaging 148,000 acre-feet <br />annually and Boulder Creek inflow averaging 139,800 acre-feet annually. <br /> <br />Ground Water <br /> <br />Ground water is a source of supply for municipal, industrial, <br />domestic, stock, and agricultural use in the basin. <br /> <br />. <br /> <br />As of 1964, approximately 1,000 wells in the study area were <br />registered in the office of the Colorado State Engineer. Table 2 <br />summarizes the number of wellslby class of service, the average <br />capacity for each class, and the maximum potential yield for <br />each class. <br /> <br />Table 2.--Ground water potential, St. Vrain Creek basin <br /> <br />Class <br />of <br />service <br /> <br />Number <br />of <br />wells <br /> <br />Maximum <br />potential yield <br />(ac.-ft./mo.) <br /> <br />1,870 <br />460 <br />5,150 <br />7,480 <br /> <br />Domestic and stock <br />Municipal and industrial <br />Irrigation <br />Total <br /> <br />904 <br />57 <br />52 <br />1,013 <br /> <br />Average <br />capacity <br />(g.p.m.) <br /> <br />15.4 <br />60.0 <br />738.0 <br /> <br />Based on 1964 records of the Colorado State Engineer's <br />office. <br /> <br />. <br /> <br />Ground water is not expected to be a significant future source <br />of water for agricultural users in the basin because: (A) the yield <br />that can actually be attained on a sustained pumping basis is probably <br />less than that shown in table 2, and (B) the only good aquifer is in <br /> <br />13 <br /> <br />a. ...1,,, <br /> <br />",,_;","'><__'_""";_ ;""__-/.i;.:~,~u,_~.i:~,;~ "";"'-j~ <br /> <br />