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T. <br /> SOUTH PLATTE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of +1.4 indicates that the overall SURFACE WATER SUPPLY INDEX <br /> conditions are above normal. Reservoir storage, the key 5 "`"Platte AIYK Basin <br /> component in this basin in computing the SWSI value, was ,, <br /> 105% of average on August 1. Storage in the major plains W 3- I -p <br /> reservoirs decreased by 98,976 acre-feet for the month. This L • T ;�..�.. " <br /> is normal for the month of July as irrigation demands peak. <br /> ' -.---------- 74 1•0--- '. <br /> Storage in the major upper basin reservoirs increased by g 1-. — ---- r <br /> 12,992 acre-feet for the month. With the exception of [." "" ' �"'= <br /> Spinney Mountain Reservoir which is at 88% of capacity, _ _ lt1 <br /> storage in the upper basin reservoirs is at capacity. y _ <br /> Precipitation was 126% of average for the month and is 93% <br /> of average for the water year. Flow at the key gaging station, 3- <br /> South Platte River near Kersey, averaged 357 cfs for the ................. ................ ....— .. <br /> JAN82 JAN83 JAN84 JAN85 JANB6 JAN87 JAN88 JAN89 JAN90 JAN91 <br /> month as compared to the historic monthly average of 876 cfs. ,loNrH/rEAa <br /> July's peak flow of 2850 cfs was a result of a significant <br /> precipitation event. Flow at the Colorado/Nebraska stateline <br /> averaged 48 cfs for the month. <br /> Outlook: SOUTH PLATTE RIVER NR. KERSEY <br /> The streamflow forecast is for normal conditions 2.8 — FLOW BY WATER YEAR <br /> throughout the basin. Irrigation and municipal water supplies 2.6 <br /> appear to be adequate. Colorado-Big Thompson Project water <br /> 2.2 <br /> supplies improved and are slightly better than last year. s 2 <br /> Junior rights well be curtailed if hot, dry conditions continue. • 1.6 <br /> Denver began diverting water from Dillon Reservoir via the ;o • <br /> Roberts Tunnel. Approximately 60,000 acre-feet will be LL5- 1.4 _ - <br /> brought to the ease slope. V 1 <br /> 0.6 <br /> Administrative/Management Concerns: <br /> 0 <br /> The lower South Platte basin (District 64)affected the 0.2 <br /> upper districts in July. The Pawnee call (June 22, 1882) was D <br /> Oct Nov Dec Jan Feb March Ap^5I lay June July A"° Soot <br /> the primary call in effect for the month. In the upper reaches WORTH <br /> of the South Platte Basin,the Denver Highline Canal (January WET(1683) + DRY o e 1981 <br /> 18, 1879) was the regulating call during the first half of the <br /> month. In the latter half of the month the Cheesman <br /> Reservoir call (June 27, 1888)was in effect. In District 2 (the <br /> reach of the South Platte immediately below Denver) the call South Platte Basin Reservoir Supplies <br /> changed throughout the month between the Platteville 260 <br /> diversion (October 15, 1873) and the Farmers Independent 240-f 7 <br /> diversion (November 20,1876). A significant precipitation 220 <br /> event on July24 allowed the District 1 Plains Reservoirs 260 A <br /> i <br /> storage right (December 31, 1929) to go into effect. i,, ,e0 <br /> ■ <br /> Public Use Impacts: 120�� <br /> Public water use should be relatively normal. Flow in <br /> the reaches of the South Platte River immediately below 3 6D_a. <br /> Spinney Mountain Reservoir and Cheesman Reservoir are at .D <br /> 149 cfs and 220 cfs, respectively. The Roberts Tunnel is ' <br /> diverting 175 cfs into the North Fork of the South Platte River. ° '�� ^may �'�� <br /> DII Ion Fbreetooth Eleven MI I• Cheeuaan J*Ok•on Barr Lake <br /> ® Avp. 7/31 Contents ® 7/31/90 Contents <br /> 3 <br />