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SOUTH PLATTE BASIN October, 1997 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 3.9 indicates that for September SOUTH PLATTE RIVER BASIN <br /> _ie basin water supplies were well above normal. Reservoir S Surface Water Supply Index"1.tory <br /> storage, the major component in this basin in computing the 4_ :. <br /> SWSI value,was 125%of normal as of the end of September. " _ <br /> W 3- <br /> Storage in the major plains reservoirs: Julesburg, North = <br /> j .A <br /> 2- <br /> Sterling, and Prewitt, decreased by 9,152 acre-feet during . :.y . _1 -�:~4 <br /> September and are at 49% of capacity. Storage in the major i 1=- r." =W ' <br /> upper basin reservoirs: Cheesman, Eleven Mile, Spinney, and i ° E <br /> Antero, decreased by 2,304 acre-feet and are at 92% of _ <br /> capacity. The mean daily flow of the South Platte River at the <br /> o: -2- <br /> Kersey gage was 1,182 cfs, as compared to the long term a <br /> average of 803 cfs. Flow at the Colorado/Kansas stateline -3- <br /> averaged 554 cfs, compared to the long term average of 240 -4 - - <br /> JAN69 JAN69 JAN90 JAN01 JAN32 JAM JAN94 JAMBS JAN96 JAN97 <br /> cfs. MONTFV YEAR <br /> Irrigation users began to curtail their use in the <br /> month of September as crops began reaching maturity. <br /> Except for some minor instances, irrigation was generally <br /> finished by the end of the month. Water supply conditions <br /> were excellent during the month with no mainstem call below SOUTH PLATTE RIVER NR. KERSEY <br /> Denver. The only calls on the mainstem South Platte were 2.9 FLOW BY WATER YEAR <br /> above Denver for storage and direct municipal use. 2.6 - . �'r <br /> 2.4 - <br /> 2.2 <br /> Outlook . 2 . . <br /> Reservoir storage levels continue to be excellent with <br /> ^ 1.6 <br /> some reservoirs on the mainstem and tributaries already at or ;. 1.4 <br /> above their winter storage limitations. There should be no ; 1.2 /...- <br /> — <br /> lifficulty filling the remaining reservoirs unless there are 1severe weather conditions that do not allow the refilling of °.6 <br /> those off-stream reservoirs which can have icing problems. 6 <br /> 0.4 <br /> The high flow conditions have also.allowed significant 0.2 - <br /> recharge to occur in September. Additional recharge is ° <br /> Oct Nov Dec Jan Feb wirCh April May June July Aug Sept <br /> anticipated to occur in October. Thus, the initial outlook for <br /> p 'YET C1693) 0 CRY(1964) A AVG X 1.97 <br /> next year's supply is very positive. ..- <br /> REPRESENTATIVE RESERVOIRS <br /> SO°TN PLATTE RIVEN NASIN <br /> 260 <br /> 240- \\ <br /> 220-/Tf\\� <br /> 200-/'�/� <br /> ! 160-/� <br /> i 160-/ <br /> _A <br /> 14° <br /> 12 <br /> u .. /i'^' \ -7 <br /> m t. 100-// \� <br /> 40 . 7 <br /> DIIIOn Noreetooth Ei.ven Nil. Chessman Jaek9en Barr Lake <br /> ® Avg. 9/30 Content. ® 9/30/97 Content. <br /> . . 3 <br />