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. <br /> SOUTH PLATTE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 3.6 indicates that for March the SOUTH PLATTE RIVER BASIN <br /> )asin water supplies were well above normal. Reservoir S sur,aoe Water supply `..d.."c.tery <br /> storage, the major component in this basin in computing the ,_ . <br /> SWSI value, was 115% of normal as of the end of March. i . ._ 1 <br /> Storage in the major plains reservoirs, Julesburg, North ▪ 3- - 1 __ , <br /> Sterling, and Prewitt, increased by 1,361 acre-feet during r° - w 1` <br /> March and are at 95%of capacity. Storage in the major upper g 1 � _ - :'.- <br /> basin reservoirs,Cheesman,Eleven Mile,Spinney,and Antero, g o -- - t� - ""n <br /> decreased by 4,117 acre-feet and are at 87%of capacity. The 4 <br /> Natural Resources Conservation Service reports April 1 1_ <br /> _ <br /> ¢ -2- <br /> snowpack as 147% of normal. The mean daily flow of the o <br /> South Platte River at the Kersey gage was 794 cfs, as -3- <br /> compared to the long term average of 846 cfs. Flow at the -4 <br /> JAN97 JAN96 JAN99 JAN90 JANB1 JAN92 JAN93 JAN94 JAWS JAN96 <br /> Colorado/Nebraska state line averaged 732 cfs. aCNTWYEAR <br /> Stream flows are at or above normal for most of the <br /> basin. Diversions continued for storage, municipal, and <br /> recharge purposes. By the end of March some irrigators <br /> began to flush their ditches, and there was some limited <br /> diversions for direct irrigation. SOUTH PLATTE RIVER NR. KERSEY <br /> FLOW BY WATER YEAR <br /> 700 <br /> Outlook <br /> Many reservoirs are already at their winter storage `°° <br /> levels,and it is anticipated they will begin filling to their final i 300 - <br /> storage levels during April. Reservoirs that have not yet filled a <br /> are expected to fill without difficulty this spring. :1 <br /> 400 <br /> It is anticipated that the runoff will be average to g �D —x <br /> significantly above average this spring. ,1'." <br /> I 200 <br /> Administrative/Management Concerns 100 , <br /> There is some concern of potential flooding due to the <br /> high snowpack. Flooding is very hard to predict because it D — <br /> Det Nov D.G Jan F.D Lerch April <br /> will be dependent upon both the snow received during the LCINTH <br /> next month and weather conditions during the melt. 0 " "9B� ` `1BE„ A x 1996 <br /> It is still anticipated that there will be shortages later <br /> in the year in the Little Thompson, Saint Vrain, and Boulder <br /> Creek basins due to the explosion at the Flatiron Pumping <br /> Station which adversely impacted the Colorado Big Thompson REPRESENTATIVE RESERVOIRS <br /> Projects ability to divert water to Carter Lake. The primary 240 PUTTS RivER BASIN <br /> parties affected will be those who lease CBT water on an 22D- <br /> annual basis. 200 J/ <br /> Based on present snowpack and storage conditions, 180 <br /> water supplies for the rest of the tributaries and main stem • <br /> L ��\ <br /> un 140�/ <br /> should be above average unless there are unusually dry 'I <br /> ^ <br /> conditions the remainder of the year. Even with the high 1DD J/ <br /> snowpack it is anticipated there will be river calls in April as p v <br /> demand for irrigation increases before the runoff begins. This g 80 <br /> is the usual situation in the South Platte basin. 20-A / --�� <br /> a /// ./ // f-- 7/ice\ <br /> D <br /> Dillon NOr1tooth Eleven MI I. Chessman Jack.on Barr Lake <br /> ® An. 3/31 contents ® 3/31/96 Contents <br /> 3 <br /> a <br />