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7. Wa.ter Supply) Reservoir Operation and Hydologic Data On November 1, 1967, the beginning of the Compact Year, there were 14,999 acre-feet of water in storage in John Martin Reservoir. Inflow to the reservoir during the winter storage period amounted to 21 ,G20 acre~feet. Outflow from the reservoir during the same period was 2,2S0 acre-feet. On March 31, 1968, there were 42,949 acre-feet in storage whIch was a total gain in storage during the winter of 27,950 acre-feet. Releases of stored water were begun at 8:30 a.m. on April 1, 1068, to meet the demancls of Colorado and Kansas. Releases were con- tinued until the reServoir was emptied at 9:00 a.m. on April 21,1968. River flow was passed through the reservoir until 3:15 p.m. on June 15, H168, wilen the gates were closed to store runoff. Releases were made again at 10:00 a.m. all June 16, 1968, at the demand of Colo- rado and the reservoir was again emptied at 9:00 p.m. on June 23, 1968. Maximum water in storage during this period amounted to 2,812 acre-feet at midnight.oll June 16, 1968. River flow was again passed through the reservoir until runoff a.bov~ the re::)~rvoir provided an opportunity to store water. The gates were closed for 10 hours beginning at 9:00 a.m. on July 28, 1968, and again for 8 hours from rrlldnighl August 14, 1968, to 8:00 a.m. on August 15, 1968. Water accumulated in storage reached a maximum of 10,518 acre-feet at midnight 011 August 12, 1968. Releases were begun at 7:00 p.m. on July 28, 1968, to meet the demands of Colorado and in- creased on July 30, 1968, to meet the demands of Kansas. Demands by both states continued until the reservoir was declared empty at noon on August 22, 1968. The reservoir remained empty and river flow was passed through the reservoir until the gates were closed at the end of the irrigation season at midnight on October 31,1968. Inflow into John Martin Reservoir during the irrigation season totaled 103,880 acre-feet which is 66 per cent of the nineteen-year average. Total diversions downstream from John Martin Reservoir during the period April I through October 31 by the ditches in Colorado Water District No. 67 was 141,300 acre..feet. Ditch diversions in Kansas for the same period amounted to 80,903 acre-feet. Reservoir releases April I through October 31 were 145,250 acre-feet which was 76,953 acre-feet less than total diversions below John Martin Reservoir. Runoff from areas below the reservoir and return flows provided 35 per cent or the water diverted during the irri- gation season. Releases from the reservoir averaged 7.5 c.I.s. from November I, 1967, to March 31,1968, and 342 c.c.s. from April I, 1968, to Octo- -9-