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. . 1000 D ~ C ~ I G '" 500 V1 I . . . . 1987 1500 - r -/ - ~. ",~/ '.- - .".<-'-.{' _n__ --- 'u "._,.;7 ,/ ----....-- _.,:...J ....n__ '"- .'" - ~---- -, - ------ - o JUL21 JUL22 JUL23 JUL24 JUL25 O~YS _.. h ARKGRACO/DISCHRG ____ FROOITK5/DI5CHRG ARKJMRCO/OI5CHRG ARKCOOKS/OISCHRG ~y STATION COllE HR JUL21 JUL22 JUL23 JUL24 JUL25 -- --------- ------- -- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- 87 ARKJMRCO DISCHRG DO 876.75 1145.94 1199.84 1158.40 1127.48 87 ARKGRACO DISCHRG DO 149.63 264.83 450.29 495.93 488.62 ~y STATION CODE HR JUL21 JUL22 JUL23 JUL24 JUL25 -- --------- ------- -- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- --------- 87 ARKCOOKS DISCHRG 00 216.55 251.43 478.44 584.40 567.01 87 FROD ITKS DISCHRG DO 6.00 5.02 22.07 24.15 51.00 . . . . . ADMINISTRATIDN DF THE ARKANSAS RIVER CDHPACT UTiliZING REAl-TIHE DATA One of the most important and effective uses of the satellite monitoring system is in the administration of the Arkansas River Compact. The responsibility of assur- ing proper deliveries to the State of Kansas belongs to the Colorado State Engineer. Senior water rights in the reach of the Arkansas River from John Hartin Reservoir to the Colorado-Kansas state1ine may dry up the river at the stateline under normal conditions during the irrigation season. The bulk of the water available to Kansas is stored in John Hartin Reservoir acquired during winter water storage (November 15 - Harch 15) or from storage during the irrigation season (Harch 15 - November 15) that occurs When the daily inflow to John Hartin Reservoir exceeds the downstream call by 10DD acre-feet. Kansas can demand reservoir releases from their account at any time. Colorado gets credit only for water delivered at the stateline measured at the gaging stations. Arkansas River near Coolidge, Kansas (ARKCOOKS) and Frontier Ditch (FRODITKS). No transit loss is deducted, however, all water reaching ARKCDDKS from the initial time of arrival plus seven days after the stop of the release is credited to Colorado as a delivery to Kansas. This includes any natural flow. Colorado is credited only up to 105% of the call amount. As such, the Division 2 Engineer and the District 67 Water Commissioner strive to deliver the exact call amount. yet not underdeliver. Kansas requested a release of 500 cfs beginning on July 21, 1987. The Division 2 Engineer coordinated the start of the release at 1000 hours. July 21, 1987, increasing the flow below John Hartin Reservoir from 500 cfs to liDO cfs. John Hartin Reservoir was operating under a "paper' spill from May 5 - June 29, 1987. This provided for reservoir inflow to match outflow. "Free river' conditions existed on the entire Arkansas River. The reservoir release, measured at the gaging station, Arkansas River below John Hartin Reservoir (ARKJHRCO). can be seen reaching the gaging station, Arkansas River at Granada (ARKGRACO) and ARKCODKS approximately 22 and 24 hours later. respectively. The combined flow at ARKCDOKS and FRDDITKS leveled out at about 610 cfs on July 24, 1987. Colorado water users diverted about 600 cfs below John Hartin Reservoir. The Division 2 Engineer lowered the release from John Hartin Reservoir by 75 cfs on July 24. 1987. to more closely match the 500 cfs delivery requested by Kansas. Hean daily discharge values are 9iven for the five day period. Robert Jesse, Division 2 Engineer William Howland, Engineering Technician