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• <br /> , <br /> SOUTH PLATTE BASIN _ December, 1998 <br /> + Basinwide Conditions Assessment: <br /> The SWSI value of-2.2 indicates that for November SOUTH PLATTE RIVER BASIN <br /> Surfed,rater Supply 1110.History <br /> the basin water supplies were below normal. Reservoir s <br /> storage, the major component in this basin in computing the ,- <br /> SWSI value, was 109%of normal as of the end of November. ,, <br /> Storage in the major plains reservoirs: Julesburg, North 3- - 'C"'°P: '-'1 ;� <br /> Sterling, and Prewitt, increased by 20,779 acre-feet during 2-r , _.• -4 r: <br /> November and are at 47% of capacity. Storage in the major * - i,. = -- 4- • r - <br /> upper basin reservoirs: Cheesman, Eleven Mile, Spinney, and g D INS 1 - - ��- �� _ " , <br /> Antero,decreased by 284 acre-feet and are at 82%of capacity. - _,_ 1�' <br /> The Natural Resources Conservation Service reports December t , ' <br /> 1 snowpack is 70% of normal. The mean daily flow of the G • <br /> South Platte River at the Kersey gage was 1,175 cfs, as _3- <br /> compared to the long term average of 917 cfs. Flow at the -4 ,• .- •...•. ... m .... .. <br /> JAN89 JAN90 JAN91 JAN92 JANS3 JAN99 JAN9S JAN96 JAN97 JAN99 <br /> Colorado/Nebraska state line averaged 585 cfs. MDNrwYEAR <br /> Flow on the South Platte and its tributaries were <br /> average or above average because of the overall favorable <br /> conditions during the last year. Reservoir storage and ground <br /> water recharge continued as the primary diversions in <br /> November. SOUTH PLATTE RIVER NR. KERSEY <br /> FLOW/Eff WATER YEAR <br /> 450 <br /> Outlook <br /> 400 <br /> While most reservoirs have not yet reached their <br /> winter storage levels, administrators do not expect that there 1 3SD <br /> / 300 <br /> 0,„.„.„....._......../ <br /> will be difficulties in filling reservoirs to their winter storage <br /> levels this year. :1 nD <br /> i <br /> W g 200 • <br /> Administrative/Management Concerns " ,SD <br /> • <br /> There were no calls on the South Platte mainstem <br /> during November except for Denver. This is indicative that .03 <br /> the water supply situation is good in the basin. In most years s° <br /> there would be a call at the Burlington Ditch for storage 0 <br /> Oct Nov bee Jan Feb Merck <br /> during November. , ,,1 <br /> O 'YET,i963) O DRY C1964) p AVG X 1999 <br /> Early snowpack is below average throughout the <br /> basin. This is not of too much concern yet. As is always the <br /> case, the overall adequacy of next year's water supply will be <br /> dependent upon late winter and early spring snows)when the <br /> state generally receives the majority of its precipitation. REPRESENTATIVE RESERVOIRS <br /> South Platte Basin <br /> 260 <br /> Public Use Impacts 2.0- 7 <br /> None. 220- <br /> 2D0 r// <br /> ,9D f/ \ <br /> eflI7 160 �///Ar <br /> ° t40J//1\\\\ <br /> b 5 920 <br /> ,.,., ,.. <br /> 1 80-////��\\ 7 <br /> i A- <br /> 77.4--\\\ /\ 77 <br /> 2° 7/%7 VA7 <br /> DIIIon Fbrsetooth Eleven Mlle Cheemen Jecreon Burr Lake <br /> ® AVg. 11/30 Cements ® 11/70/96 Contents <br /> • <br />