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<br />~ <br /> <br />!f- <br /> <br />PROJECT WATER <br />REQUIREMENT <br /> <br />'" <br /> <br />Irrigation Water Requirement <br />1 - (Conveyance + Storage +Operationa1)Losses <br /> <br />Conveyance Loss <br /> <br />Ditch seepage (35.8 miles unlined ditches) 12% <br />Ditch phreatophyte & evaporative (61 acres) 4 <br />Stream seepage, phreatophyte & evaporative 1 <br /> <br />Subtotal 17% <br /> <br />Storage Loss <br /> <br />Reservoir seepage, evaporative, & phreatophyte <br />(65 acres) <br /> <br />13% <br /> <br />Operational Loss <br />Regulatory losses, good management 5% <br /> <br />TOTAL 35% <br /> <br />PROJECT WATER REQUIREMENT = 1171.1 ac-ft. <br />1 - ( 0.35 ) <br /> <br />','., <br /> <br />= 1801.7 acre-feet of storage <br /> <br />'.j <br /> <br />B. Surface Water Source <br /> <br />The primary source of surface water for the Hyannis <br />Peak project site is the middle fork of Arapahoe Creek. <br />Annual flow records, provided by the Colorado State <br />Division of Water Resources, for the middle fork are <br />available for only one year. This gaging station <br />was located slightly downstream of the Hyannis Peak <br />Reservoir site. <br /> <br />During the year of record, 1979 - 1980, an average <br />annual flow rate of 8.7 cubic feet per second (cfs) <br />was observed. Of this, 66% occurred between May and <br />August, with the peak month of June averaging 36.8 cfs. <br />Winter flows of 4 cfs occurred during the months of <br />October through March. A maximum flow rate of 58.7 <br />cfs was recorded on June 11, 1980. Figure 1 is a <br />graphical representation of the flow rates for 1980 <br />on the middle fork of Arapahoe Creek. <br /> <br />Since flow records for the middle fork of Arapahoe <br />Creek are not available for more years, flow records <br />from three gaging stations located on North Platte <br />drainage streams within twenty miles of the Hyannis <br />site were evaluated (see Sheet 1). The following <br />summarizes data obtained from "Water Resources Data <br />for Colorado"-U.S.G.S. Water Data Reports CO-76,77, <br />78, 79-1. <br />