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.. .. <br /> SOUTH PLATTE BASIN <br /> Basinwide Conditions Assessment: ""— <br /> The SWSI value of +3.0 indicates that the overall SURFACE WATER SUPPLY INDEX <br /> conditions are above normal. Reservoir storage, the key S South Platte River 9..1n <br /> component in this basin in computing the SWSI value, was 4_ <br /> 112%of average on September 1. Storage in the major plains - JV <br /> reservoirs decreased by 74,400 acre-feet for the month. This - '` 4 <br /> is normal for the month of August as irrigation demands ,� ? <br /> continue. Storage in the major upper basin reservoirs 1 1-. Y 4 .. . -" A <br /> decreased by 3,317 acre-feet for the month. With the i a 1�'`i..-. <br /> it f !if <br /> exception of Spinney Mountain Reservoir which is at 86% of <br /> capacity, storage in the upper basin reservoirs is at capacity. tE. <br /> a -2_ <br /> Precipitation was 156% of average for the month and is 99% <br /> of average for the water year. Denver had the fourth wettest "3- <br /> August on record. Precipitation by September 1 was 16.08 • __ - <br /> JANa2 JAN93 JAN14 JAMS JANaa JAN67 JANOS JAN69 JAN90 JAN91 <br /> inches as compared to average on that date of 12.20 inches. M.]IfM1VYEAR <br /> The average annual precipitation for Denver is 15.89 inches. <br /> Flow at the key gaging station,South Platte River near Kersey, <br /> averaged 789 cfs for the month as compared to the historic <br /> monthly average of 734 cfs. The August peak flow of 3500 cfs <br /> was a result of a significant precipitation event. Flow at the SOUTH PLATTE RIVER NR. KERSEY <br /> Colorado/Nebraska stateline averaged 58 cfs for the month. 2.t FLOW BY WATER TEAR <br /> 2.6 <br /> Outlook: . <br /> 2.2 <br /> The streamflow forecast is for normal conditions 1 2 <br /> throughout the basin. Irrigation and municipal water supplies 4 IA , - <br /> aPPear to be adequate. Colorado-Big Thompson Project water <br /> a 1.4 <br /> supplies improved and are slightly better than last year. "-= 12 _ <br /> Denver discontinued diverting water from Dillon Reservoir via 1 <br /> the Roberts Tunnel in late August. Approximately 30,000 1 a.a - <br /> additional acre-feet will be brought to the east slope through °° <br /> 0.4 <br /> the Roberts Tunnel beginning in late October. 0.2 <br /> ° <br /> Oct Nov Dec Jan Feb Mreh Apr I I May Jun. July Aug Sept <br /> Administrative/Management Concerns: MONTH <br /> The most senior River call on the South Platte River 0 <br /> WET"9 <br /> 93' * °`"`164' 0 AVG. ° 1991 <br /> for the month was the Platteville diversion (10-15-1873) in <br /> district 2 going into effect on August 1, 1991.The most junior <br /> call in effect for the month was the District 1 Reservoirs <br /> storage right (12-31-1929) that went into effect on August 5, South Platte Basin Reservoir Supp I i es <br /> 1991, as the result of a significant precipitation event. 260 �\ <br /> 240- \\ <br /> Public Use Impacts: 220 � <br /> Flow in the reaches of the South Platte River 2Do � <br /> lea J/ <br /> immediately below Spinney Mountain Reservoir and • 1w <br /> Cheesman Reservoir are at 110 cfs and 620 cfs, respectively. • <br /> 1,0 <br /> The releases from Cheesman Reservoir will be reduced to J 12D <br /> approximately 200 cfs by October 1 and to approximately 50- e imp...AN 7 7 . <br /> 75 cfs by November 1. 3 <br /> 40 <br /> 20�r/n � //\\ \-7 r77N <br /> Dillon Hore.tooth Eleven Mlle Che.e..n Jackson arr Lake <br /> ® Avg. 6/31 Content. ® 9/31/S0 Content. <br /> 3 <br />