DWR_4151909 - Laserfiche WebLink

, . w SOUTH PLATTE BASIN June, 1998 ` Basinwide Conditions Assessment: The SWSI value of 3.2 indicates that for May the SOUTH PLATTE RIVER BASIN Oasin water supplies were above normal. Reservoir storage, 5 5ur,"'Water Slimly Ind.History the major component in this basin in computing the SWSI 4_ . value, was 105% of normal as of the end of May. Storage in - _ A,• : ..;r • the major plains reservoirs: Julesburg, North Sterling, and • 3 f - `r` Prewitt, increased by 4,426 acre-feet during April and are at 2-• _ . �` •» ' = ' Q 100% of capacity. Storage in the major upper basin 1- • �" — , . IFS I-. - --, reservoirs: Cheesman, Eleven Mile, Spinney, and Antero, § 0 increased by 8,424 acre-feet and are at 88% of capacity. The - - �;;1hej mean daily flow of the South Platte River at the Kersey gage Y ¢ _2- was 2,367 cfs, as compared to the long term average of 2,264 cfs. Flow at the Colorado/Nebraska stateline averaged 1,333 -3 cfs. -, ...._._ _ __ _.. JAN99 JAN90 JAN91 JAN92 JAN93 JAN64 JAN65 JAN96 JANO7 JAMB As irrigation demand increased in May there were ACHTW TEAR shortages of water along several of the tributaries, creating calls for water. This is not unusual for this time of year as irrigation demand increases prior to the beginning of runoff. Toward the end of the month runoff had reached a level where there were not shortages in most of the tributaries. SOUTH PLATTE RIVER NR. KERSEY The mainstem of the South Platte did not have a call - FLOW BY WATER YEAA down stream of Denver due to return flows, rain storms, and 2.6 11. '* - early season runoff. In fact,the Corps of Engineers continued 2.4 2.2 regulation, began in April, of Chatfield Reservoir due to the $ 2 / . high flow conditions at the southern end of the basin and z 1.8 related high stage of the reservoir. The flow conditions ;0 1. 5, 1., . allowed for mainstem reservoirs to be maintained full and for u- 1.2 . additional recharge to occur along the South Platte. s>1 1 1 0.B . Outlook 0.4 Storage and recharge will continue for 2 or 3 weeks O.2 in June before it is expected that there will once again be n I '�-`---' Oct Nov Vac Jan Fab (Arch Port Way J. Ju I Ao0 Soot direct flow calls both on tributaries and the mainstem IAO1,1 downstream of Denver. If there is significant rain the latter c19� ` CRY C1�+7 o x 1966 half of June the call could be delayed even further. With continued storage and recharge in June it is expected that the supply going into the summer will be adequate. REPRESENTATIVE RESERVOIRS 260 SOUTH PLATTE RIVER BASIN 2,0- 220 200n M s 1B0 ,.....0..\\\ 'i „off/,,,;„ --/ 7 1Bo 7 7 g 60 7\7, 2° 7\ .7 777 DI 1 ion Har°•tooth EIAVOn MI I• Ch••aron Jackson Barr L*. ® AVp. 5/31 Content• ® 5/31/98 Content• 3