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SOUTH PLATTE BASIN December, 1997 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 2.0 indicates that for November the SOUTH PLATTE RIVER BASIN <br /> basin water supplies were above normal. Reservoir storage, s Suisse Water Supply Index History <br /> the major component in this basin in computing the SWSI 4_ ,.. <br /> value, was 128% of normal as of the end of November. <br /> d- <br /> Storage in the major plains reservoirs: Julesburg, North 3 3 ` `N 4" <br /> Sterling, and Prewitt, increased by 30,661 acre-feet during 2 ' _ •4. 1 L : : v r_-,—...- <br /> November and are at 74% of capacity. Storage in the major 5 ..----- -�' -W , <br /> :-.. <br /> �upper basin reservoirs: Chessman, Eleven Mile, Spinney, and i ° - 1 .c--� I� <br /> Antero, decreased by 7,275 acre-feet and are at 89% of 9 <br /> capacity. The Natural Resources Conservation Service reports r _, <br /> a -2 <br /> December 1 snowpack as 123% of normal. The mean daily <br /> flow of the South Platte River at the Kersey gage was 1,631 3 <br /> cfs, as compared to the long term average of 894 cfs. Flow at <br /> JANBB JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 <br /> the Colorado/Kansas stateline averaged 1,245 cfs, compared MDNTWYEAR <br /> to the long term average of 347 cfs. <br /> Flow on the South Platte and its tributaries was <br /> significantly above average during November because of the <br /> overall wet conditions during the last year and the runoff from <br /> early snowfall. SOUTH PLATTE RIVER NR. KERSEY <br /> Most reservoirs filled to their winter storage levels in 450 FLOW 8Y WATER YEAR <br /> November, if they had not already been filled previously. 400 <br /> • <br /> 350 <br /> ...............______,.../ <br /> Outlook $ <br /> Early snowpack is above average. This early n 300 <br /> snowpack,along with the excellent storage conditions,provide ,.e 25O <br /> a good start to next year's supply. As is always the case, the W g 200 <br /> overall adequacy of next year's supply will be dependent upon s 1S0 , <br /> late winter and early spring snow, the times when the <br /> 100 - <br /> mountains generally receive the majority of their precipitation. <br /> SO <br /> Administrative/Management Concerns 0 <br /> OCt Nov Dec Jan Feb March <br /> There were no calls on the mainstem during MDNTH <br /> . WET C1903, O DRY C1984) A AVG x 1997 <br /> November except for Denver. This is indicative of a good <br /> water supply situation in the whole drainage. In most years <br /> there would be a call for storage at the Burlington Ditch <br /> during the month. <br /> REPRESENTATIVE RESERVOIRS <br /> south Platte Basin <br /> 280 <br /> 240-. <br /> 220- \\\\\\\ <br /> NO ,..,A <br /> .+ <br /> 180 <br /> i!t 160 <br /> l 140 <br /> hF <br /> 120 <br /> flv 180 AN <br /> > 60 / <br /> Dillon Horcetooth Eleven Mlle Cheecmen Jackson Barr Lake <br /> ® Avg. 11,30 Content* ® 11/30/97 Contents <br /> 3 <br />