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I <br /> SOUTH PLATTE BASIN <br /> • <br /> Basinwide Conditions Assessment: <br /> The SWSI value of+2.8 indicates that for August the SOUTH PLATTE RIVER BASIN <br /> Surfs.Water Supply Index Hlatory <br /> asin water supplies were above normal. Reservoir storage, 5 <br /> the key component in this basin in computing the SWSI value, 4 <br /> was 108% of normal on August 31. Storage in the major 3 ai , __ <br /> plains reservoirs, Julesburg, North Sterling, and Prewitt, - == - <br /> decreased by 36,852 acre-feet during August and are at 30% 2 -� - 7 1 ). <br /> of capacity. Storage in the major upper basin reservoirs, J 1 <br /> Cheesman, Eleven Mile, Spinney, and Antero, decreased by D <br /> 682 acre-feet and are at 93% of capacity. The mean daily ; <br /> flow at the Kersey gage on the South Platte River was 463 cfs, , <br /> as compared to the 1961-1991 August average of 627 cfs. The <br /> National Weather Service reports August precipitation as 91% -3 <br /> of normal. -4 <br /> JA11S4 JANSS JANOS JAN67 JAP68 JAN89 JAN90 JAN91 JAN92 JAN93 <br /> MONTH/YEAR <br /> SOUTH PLATTE RIVER NR. KERSEY <br /> FLOW SY WATER YEAR <br /> 2.■ <br /> 2.; - 43 <br /> 2.4 <br /> 2.2 <br /> 2 <br /> } 1.8 <br /> 1 1.8 <br /> !2 <br /> 1.4 <br /> g v 1.2 <br /> 1 <br /> 0.0 - + <br /> 0.8 <br /> 0 4 <br /> 0.2 <br /> O <br /> Oct Noy Doe Jan Fab harsh April May June July Auo ;Apt <br /> MONTH <br /> 13 WET[1.M a OM(14184) • AVG x 1903 <br /> REPRESENTATIVE RESERVOIRS <br /> SOUTH PLATTE RIVER BASIN <br /> 2;0 <br /> 240 <br /> 220 <br /> 200 A Z 180 <br /> tr, 150-7,/,;:\:\ <br /> .1 140 <br /> 11g 120 <br /> a• <br /> ny ,sa 7-40 <br /> sa <br /> CO-A <br /> O �/�\ �//f_�\\fit <br /> Dl l lon Horr.t.oth Eleven Y11a Clawson Jackson parr Lake <br /> ® Aso. 0/01 Content. ® W3VS11 Content. <br /> 3 <br />