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SOUTH PLATTE BASIN November, 1997 <br /> $ <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 3.9 indicates that for October the SOUTH PLATTE RIVER BASIN <br /> asin water supplies were well above normal. Reservoir 5 So-face Water Supply 1.9..History <br /> storage, the major component in this basin in computing the ,_ . <br /> SWSI value, was 126% of normal as of the end of October. , 3_ I .�`�`.1 .'Storage in the major plains reservoirs: 3ulesburg, North . _ f �^ r <br /> 4 <br /> Sterling, and Prewitt, increased by 10,647 acre-feet during 2-'.77- . . .. - • :j <br /> October and are at 58% of capacity. Storage in the major 5 1 ' a;�i <br /> upper basin reservoirs: Cheesman, Eleven Mile, Spinney, and E ° d"~ <br /> Antero, decreased by 6,119 acre-feet and are at 89% of _,- , <br /> capacity. The mean daily flow of the South Platte River at the .1 <br /> ¢ _2_ <br /> Kersey gage was 1,449 cfs, as compared to the long term <br /> average of 859 cfs. Flow at the Colorado/Kansas stateline _3- <br /> averaged 1,052 cfs, compared to the long term average of 294 -; .. -- . .... ... mm <br /> JAN66 JAN99 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 <br /> cfs. 10Nr , <br /> The irrigation season was completed in October. As <br /> is typical for October the water supply was adequate to meet <br /> demand throughout most of the South Platte basin <br /> downstream of Denver. There was no mainstem call the <br /> whole month below Chatfield Reservoir. This water year SOUTH PLATTE RIVER NR. KERSEY <br /> turned out to be very good as far as water supply for irrigation 210 <br /> FIRST NORTH ,►E""�YEAR <br /> 0 <br /> and municipal use is concerned. 190 <br /> 16 <br /> 160 _ <br /> 170 <br /> 160 <br /> Outlook 1S0 <br /> M <br /> With the irrigation season ended diversions will be n 1130 <br /> 40 <br /> primarily for storage, recharge, and continued municipal use. Y i ;;0 <br /> Significant recharge has already occurred along the South e g <br /> 1ap <br /> 90 (f/7 <br /> Platte due to the good stream flow conditions. `s 70 <br /> Reservoir levels both on the mainstem and tributaries 60 <br /> :2 /4 ii ,7 <br /> are in excellent shape, and it is anticipated that there will be p <br /> no difficulty in filling reservoirs. Many reservoirs are already � � //,�� <br /> at their winter storage levels. Likewise,stream flows continue <br /> 0CT06ER 1997 OCT.AVG. C'61-'96) HIGH C1965) LOW C1965) <br /> to be at or above average. The flows were significantly above <br /> average the last week of October as runoff occurred from the <br /> heavy snowstorm of the 24th and 25th. <br /> Public Use Impacts <br /> The snowstorm the last week of October did make for Representative Reservoirs <br /> some concern in harvesting the remaining crops which were 260 South Platte River Basin <br /> in the field. Warm dry conditions subsequent to the N0 <br /> snowstorm should alleviate this concern as farmers should be 220 <br /> 200 <br /> able to harvest any remaining crops. z ,90 <br /> �n <br /> 160 <br /> 1 11° j <br /> ■ <br /> 100 <br /> 60 <br /> Dillon Norsetooth Eleven Mlle Choevnnn Jackson Barr Lake <br /> ® Avp. 10,31 Contents ® 12/31/97 Contents <br /> 3 <br />