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SOUTH PLATTE BASIN May, 1998 <br /> l <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 2.2 indicates that for April the SOUTH PLATTE RIVER BASIN <br /> basin water supplies were above normal. Reservoir storage, s 6ur4ace M.t.r swvlY 'Id.<"I slaty <br /> the major component in this basin in computing the SWSI 4..value,was 113%of normal as of the end of April. Storage in - - 7 , <br /> the major plains reservoirs: Julesburg, North Sterling, and • 3 <br /> Prewitt, increased by 4,370 acre-feet during april and are at 2-• rt; . •i ' •= <br /> I ME <br /> 97%of capacity. Storage in the major upper basin reservoirs: - =� ,� �` MIMI <br /> Cheesman, Eleven Mile, Spinney, and Antero, increased byi 0 iI �- . • It'''' <br /> r i ,; 1 <br /> 6,885 acre-feet and are at 85% of capacity. The Natural _ <br /> Resources Conservation Service reports May 1 snowpack as :1 <br /> ¢ _2- <br /> 111% of normal. The mean daily flow of the South Platte o <br /> River at the Kersey gage was 2,599 cfs, as compared to the -3 <br /> long term average of 1,090 cfs. Flow at the -4 <br /> JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 JAN98 <br /> Colorado/Nebraska stateline averaged 1,364 cfs, compared to ►A NTWY£AR <br /> the long term average of 553 cfs. <br /> Flows on the mainstem and most tributaries continue <br /> to far exceed average. There were no calls for water in the <br /> South Platte Drainage downstream of Denver in April, and no <br /> calls any where on the South Platte during the later part of SOUTH PLATTE RIVER NR. KERSEY <br /> April due to the wet conditions and above average flows. It 1,3 - <br /> FLOW BY WATER YEAR <br /> is very rare when this call situation exists. Regulation of 1.2 . <br /> Chatfield Reservoir was taken over by the Corps of Engineers 1.1 " <br /> the latter portion of April due to the high flow conditions in 0 9 <br /> the southern portion of the basin and related stage of the <br /> reservoir. p 0.7 <br /> u- 0,6 - <br /> Outlook IS 0,5 !'' ', <br /> 0,4 <br /> At the end of the month snowpack is better as one _____....--- <br /> a.3 <br /> moves south in the basin. Overall, it was about average. 0.2 —. , <br /> Reservoir storage continued to be in excellent shape with the a., <br /> approach of the irrigation season. With the continued above a <br /> oot Nov Doc Jan Feb March Apr1I MAY <br /> average flow in the South Platte,it appears unlikely there will ,,,H,,, <br /> O WET C1183) 0 DRY C1994) A AVG x 1998 <br /> be an early season call of water in the basin prior to runoff, <br /> which is not a normal occurrence. Flows will increase the <br /> next several weeks as snow melt begins. <br /> Administrative/Management Concerns REPRESENTATIVE RESERVOIRS <br /> The Northern Colorado Water Conservancy District 260 sovni PLATTE AIYER 84SIN <br /> (Northern) set their Colorado Big Thompson (CBT) quota at 240- <br /> 50%delivery for 1997. This is the expected quota when there 220- <br /> are abundant supplies. In addition, Northern made available �200 \ <br /> \acre-feet of excess CBT water that could not be stored : 180 <br /> to meet direct flow demand uses in May on the tributaries and ' ,40il <br /> mainstem of the South Platte within Conservancy District h g 120 <br /> Boundaries. F10 <br /> 0 <br /> ,0 A <br /> - //- // /-\\_ ^/\ 7/7 7-\ , <br /> Dl l ton Norsstooth Eleven IN llo Chao6ero B n /Jackson /arr Lake <br /> ® Avg.4/30 Contents ® 4/30/98 Contents <br /> 3 <br />