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SOUTH PLATTE BASIN. July, 1998 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 2.5 indicates that for June the SOUTH PLATTE RIVER BASIN <br /> )asin water supplies were above normal. Reservoir storage, s Surfao.Meter Supply ' "e.tery <br /> the major component in this basin in computing the SWSI 4- <br /> value, was 100% of normal as of the end of May. Storage in 3- :Ala • ._ <br /> the major plains reservoirs: Julesburg, North Sterling, and a . <br /> Prewitt, decreased by 4,120 acre-feet during June and are at -• L` <br /> 97%of capacity. Storage in the major upper basin reservoirs: 1- �* � .a I -- _ <br /> Cheesman, Eleven Mile, Spinney, and Antero, increased by ° A - <br /> 8,564 acre-feet and are at 91% of capacity. The mean daily - - <br /> "' <br /> flow of the South Platte River at the Kersey gage was 1,184 a _2- <br /> l <br /> cfs, as compared to the long term average of 3,527 cfs. Flow <br /> at the Colorado/Nebraska stateline averaged 1,176 cfs. -3- <br /> Several rainstorms and the runoff kept a call off of the -4 , ...... -- ....... .... .. ... .... ----- <br /> JAN99 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JANG7 JAN90 <br /> mainstem of the South Platte and many tributaries until the M.1..y5m <br /> latter part of June. The flow in the South Platte dropped <br /> dramatically toward the end of the.month. For example, the <br /> flow of the South Platte near Kersey dropped from over 2,400 <br /> cfs on June 10 to less than 400 cfs by the 21st. With lower <br /> flows and hot weather, the demand for water exceeded the SOUTH PLATTE RIVER NR. KERSEY <br /> supply in most basins, with resulting calls. This is not 2.9 - FLOW SY WATER YEAR <br /> unusual for this time of year,but was a major departure from 2.8 . . <br /> Si <br /> the previous two years where the water supply far exceeded 2.4 <br /> 2.2 <br /> demand in June and the main concern was possible flooding. 1 2 .. <br /> The senior call for the South Platte mainstem was an + 1.9 - <br /> 1882 call in District 2,the reach between Denver and Kersey. <br /> Continued runoff conditions in the Clear Creek basin '= 14 <br /> u.� 1.2 <br /> substantially helped flow conditions on the South Platte, 1 <br /> especially in District 2,keeping an even more senior call from I 0.9 <br /> occurring. There was no call on the lower end of the river 0.6 <br /> D.4 <br /> below Balzac until the end of June due to difficulties in 0.2 ;�, • <br /> keeping sand dams in place. 0 - - <br /> Det Nov Ore Jan Feb Mereh Aorll May June July AW Sept <br /> MONTH <br /> Outlook O WET[1999D $ °Nv[1944) A AVG x 1999 <br /> Though flows have dropped off dramatically, no <br /> widespread water shortages are expected this summer because <br /> of the excellent storage conditions. The only negative for <br /> agriculture so far this season is associated with hail damage REPRESENTATIVE RESERVOIRS <br /> caused by some intense thunderstorms. 260 90UTH PLATTE RIVEN OASIS <br /> 24077 <br /> Administrative/Management Concerns 22D <br /> 200 <br /> The State of Kansas has Bled suit against the State of i 16°�� <br /> Nebraska over use of waters tributary to the Republican River. t,, ..-A <br /> Colorado is a party to the suit as it is a signatory to the 7 1 140 <br /> Republican River Compact. Colorado's role is expected to be a i 1�A 7 <br /> less than the other 2 states as it is not a major water user in '0 f\ <br /> 77 <br /> the basin and is in compliance with the compact. , <br /> 2°......7/\\ &\ ' \\ 7/-7 717 <br /> Dlflon Hors tooth Eleven Mel. Ch.eelmn Jeekeon herr Lek. <br /> ® Avg. S/!0 Content. ® 9130/99 Content. <br /> . <br /> 3 <br />