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- *4 SOUTH PLATTE BASIN <br /> t Basinwide Conditions Assessment: <br /> The SWSI value of -1.3 indicates that the overall SURFACE WATER SUPPLY INDEX <br /> conditions are below normal. Reservoir storage, the key a - south Platte Maur Sawn <br /> omponent in this basin in computing the SWSI value, was 4— <br /> 07% of average on March 1, 1991. Storage in the plains . <br /> , <br /> reservoirs in the basin increased by 35,038 acre-feet for the • 3 r �. <br /> month. Cheeseman and Spinney Mountain Reservoirs are I • 1" 'r ' • <br /> currently providing water supplies to Aurora and Denver. 4 1— /1....., ,..e....... f - ' W <br /> However,precipitation was only 22%of average for-the month 1 °- 1 r' _" ;Lof February, and is in a four month decline. Basinwide -,_ fC <br /> snowpack is only 61% of average. There is still time for the _ <br /> snowpack to improve as the peak accumulation typically o -' <br /> doesn't occur until around May 1st. However,the early March -'- <br /> storms that provided heavy snow to much of the state had <br /> JAN81 JANR2 JA1413 JAN14 JAN85 JANM JANO7 JANS/ JANQ JAN92 JAN91 <br /> minimal impact on the South Platte Basin. Flow at the key Wahl,YEAR <br /> gaging station, South Platte River near Kersey, averaged 773 <br /> cfs for the month as compared to the historic monthly average ' <br /> of 797 cfs. Flow at the Colorado/Nebraska stateline averaged <br /> 639 cfs for the month. This is a significant increase over <br /> the average flow in November of 155 cfs. This is the result of <br /> irrigation return flows below Balzac and a shortage of lower SOUTH PLATTE RIVER NR. KERSEY <br /> South Platte basin storage capacity. The majority of ground 4S0 PLOWEY <br /> RATER 'E"" <br /> water recharge projects are operating at near capacity. <br /> Outlook: "° <br /> Even with above normal precipitation in March + <br /> through April in the basin, snowpack going into the 1991 a i 2ia - <br /> runoff season will likely be 30%-40% below normal. w 2 <br /> Snowpack in the Saint Vrain basin is only 47% of average. .� <br /> he streamflow forecast is lowest in the Saint Vrain Creek <br /> rainage at 60% of average and highest in the Bear Creek 100 <br /> drainage at 80% of average. a° - <br /> a <br /> Oat Nav Csa Jan F•o March <br /> Administrative/Management Concerns: , ,,,, <br /> 0 s!T C 1667J i OAf C 1If/A) o AVO. a 1ss1 <br /> The interstate compact with Nebraska adjusted on <br /> October 15 basically giving Colorado full use of available ' <br /> streamflow. District 2 (South Platte River between Denver <br /> and Greeley) went to "open river" administration on <br /> January 2, 1991. The river call for District 8 (South Platte <br /> River above Denver) was changed to the Denver South Platte South Platte Basin Reservoir Supplies <br /> River intake right (May 1, 1899 decree). This call affects 240 <br /> administration of the South Platte River above the Denver 220- <br /> intake at Strontia Springs Reservoir up to the headwaters in 20° � <br /> South Park. In addition, the Denver Water Department 1 1i° <br /> requested the Chatfield Reservoir call (December 12, 1977)be + /SO <br /> implemented on January 2, 1991. § 1'° <br /> 12o -7 <br /> Public Use Impacts: gt. 1� r� <br /> Public water use should be relatively normal. m .° <br /> However, flow in the reaches of the South Platte River .° /7\ N <br /> immediately below Spinney Mountain Reservoir and 2° ^ 7 <br /> Cheeseman Reservoir are relatively low at 40 cfs and 60 cfs, a ^� 7/7 <br /> OI I lon MOraatooth Elawn all 1• Ch••man Jackson 13rr L.A. <br /> respectively. <br /> ® Av°. 2/26 fpnt•nts ® 2/21//91 Wnt•nta <br /> 3 <br />