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SOUTH PLATTE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 0.8 indicates that for April the SOUTH PLATTE RIVER BASIN <br /> basin water supplies were near normal. Reservoir storage,the 5 Surf"' ter suF,olr I.9.."I"cry <br /> _ major component in this basin in computing the SWSI value, 4_ . <br /> was 101%of normal on April 30. Storage in the major plains ,���k _ 1 <br /> reservoirs,Julesburg,North Sterling,and Prewitt,increased by 2_I - < <br /> 5,638 acre-feet during April and are at 99% of capacity. a J : <br /> r <br /> Storage in the major upper basin reservoirs,Cheesman,Eleven ! ,- �." <br /> Mile, Spinney, and Antero, increased by 6,844 acre-feet and o D =mu■ A •.,I <br /> • <br /> are at 86% of capacity. The Natural Resources Conservation _ 1 , <br /> Service reports May 1 snowpack as 122% of normal. The . <br /> cr _2_ <br /> mean daily flow of the South Platte River at the Kersey gage <br /> was 313 cfs, as compared to the 1961-1993 April average of -0 <br /> 992 cfs. Flow at the Colorado/Nebraska state line averaged 4 <br /> JANB6 JAN67 JANBB JAN09 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 <br /> 258 cfs. The National Weather Service computes basin NORTH/YEAR <br /> precipitation as 175% of normal during the month. <br /> The calls on the main stem downstream of Strontis <br /> Springs Dam during April were generally for direct irrigation <br /> during the first 10 days, and then turned to storage and <br /> recharge. The wet conditions completely removed the call SOUTH PLATTE RIVER NR. KERSEY <br /> downstream of Cheesman reservoir at the end of the month. 700 FLOW BY WATER YEAR <br /> Outlook 600 <br /> The increased snowpack has removed much of the t 500 <br /> concern over a less than normal runoff. <br /> V <br /> e t 400 - <br /> 2. <br /> Administrative/Management Concerns i 300 <br /> Many of the plains reservoirs were able to "top off' s • <br /> during April. The precipitation also allowed for significant 1 200 <br /> filling of reservoirs on tributaries. Even with the rainfall, 100 <br /> there are concerns that reservoirs on tributaries may not fill <br /> since they were so low prior to April and their inlet ditches D <br /> Oct Nov Dec Jan F.O. March Apr II <br /> limit filling rates. Continued wet conditions may be necessary MONTH <br /> to fill these reservoirs. o WET C1993) o DRY c1964J A AVG X 1995 <br /> The South Platte Water Rights Management System, <br /> developed with funds from water suppliers and the Colorado <br /> Water Conservation board, is especially helpful in <br /> administration during changing conditions as were REPRESENTATIVE RESERVOIRS <br /> experienced last month. The system allows for access of 2,D sarrai PLATTE RIVER BASIN <br /> stream flow and other information in a timely and user 2,900D—if <br /> friendly format. All of the water commissioners in the South 170 <br /> Platte drainage will be working with the system within the : ;50 <br /> next month. 140 <br /> cF ,„D 20 / <br /> g, - <br /> Public Use Impacts " <br /> The wet conditions did keep many farmers from a V g0 ^� <br /> planting their corn during April. This would only become an 50 <br /> issue of concern if wet conditions persist until after the middle 40 <br /> of May. ,o-� 7 <br /> The Northern Colorado Water Concervancy District D <br /> DTI IC^ Horwtooth Eleven Mlt. Ch..r.+nnn Jeckca^ Barr Lake <br /> met during April and set a quota of 80% for delivery of <br /> Colorado Big Thompson water. �71 AV9 4.30 cont... ® 4/30/95 Contents <br /> 3 <br />