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t <br /> . ARKANSAS BASIN July, 1998 <br /> le <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 0.1 indicates that for June the ARKANSAS RIVER BASIN <br /> basin water supplies were near normal. Flow at the gaging 5 <br /> Surface gator Supply Index 111story <br /> station Arkansas River near Portland averaged 1,705 cfs, as 4- <br /> compared to the long term average of 2,362 cfs. Storage in -la _ - [ ' <br /> Turquoise, Twin Lakes, Pueblo, and John Martin reservoirs 3 ;` [7t1 -, ; �' . <br /> totaled 164% of normal as of the end of June. 2- -= .4. <br /> A cool period in June held the runoff peak in the 1 ,- 1 1I ; ° r <br /> Arkansas to 2,200 cfs of native flows. This peak occurred in i 0 <br /> early June. The river has held fairly steady at 1,500 cfs since - v <br /> • then which has provided a good steady supply of water to _ _ , <br /> most major water rights except the more junior decrees. <br /> a 2 <br /> -3 <br /> Outlook -4 4 <br /> JAN89 JAN90 JAN91 JAN92 JM63 JAN94 JAN95 JAN96 JAM', JAMB <br /> It is expected that the native flows will decrease to IONTWYEAR <br /> approximately 500 cfs by the end of July. <br /> Administrative/Manazement Concerns • . <br /> JAW <br /> • In order to improve the computer model being used " <br /> by both Kansas and Colorado in the litigation between the ARKANSAS RIVER NR. PORTLAND <br /> states, Division of Water Resources staff are working to i <br /> FLOW BY WATER YEAR <br /> develop better data on irrigated acreage in the basin. This 0.9 <br /> work includes a plan for use of both aerial photograph and 0.8 <br /> satellite imagery as part of the Geographic Information System s <br /> to determine acreage under each ditch system served by ... <br /> surface water only, by surface and ground water, and by 3 <br /> 0.s . <br /> ground water only. Digitizing of aerial photographs and field LL- <br /> _i v 0.4 <br /> polygons previously used in the litigation facilitate use of key <br /> background information. Inclusion of actual well locations for 0.3 <br /> nonexempt wells is also being done. Efforts are well 0.2 <br /> underway and should advance significantly during 1998. <br /> Oct Nov Doc Jsn Feb L4rch Apr11 Noy June July Aug Sept <br /> Public Use Impacts .ION1'„ <br /> During late June- and early July 600-1,000 cfs are 0 <br /> WET <br /> "9.4' °R c+sm A AVG X 1791 <br /> being released to either Pueblo Reservoir or the Colorado <br /> Canal from Twin Lakes and Turquoise Reservoirs. This water <br /> is being used to refill Pueblo Reservoir and to irrigate lands <br /> under the Colorado Canal, but is also providing for a very REPRESENTATIVE RESERVOIRS <br /> optimal flow level for the rafting industry on the Upper 280 , AW.NSAC RIVER BASIN <br /> Arkansas. 260- <br /> Large irrigation demands by Kansas and far eastern 24 <br /> 0 <br /> - • <br /> 220- <br /> Colorado i irrigators have reduced John Martin Reservoir 200- <br /> g <br /> contents to 75% of its active capacity. Pueblo Reservoir was t n ie°- <br /> 0 <br /> drawn down by irrigation demands to 80% of its current .i Leo- , <br /> active capacity before it began to be refilled. h1 - <br /> P tYM~ ,20 <br /> .77 <br /> / <br /> ■ 100 1j/ \ <br /> 3 9a JSO / � ,V <br /> John Martin Fuel:,I T1rOuo194 Twin Lake. <br /> ® Avg. 6130 Content■ 179 6'30r71 Contents <br /> 4 <br />