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,.',j +,,-.4}'-" April 12-15 4 days ~ RESEARCH DISCHARGES FROM GLEN CANYON DAM 1990-1991 1000 cfs constant (aerial photography for development of base map for GIS and sediment and ~ biotic studies.) v""!'> April 16.-JI'il May 3 May 4-6 ) ~ May 7-167 10 low J 17-20 ~ ~ May 21-30 )0 31-June 3 '-/ June 4- '"2~ July 12-:J July 13-15 '3 Normal spring operations discharges (11-18 days) 3,000 efs constant (impact analysis) oischarge o*{ 3000-26,200 cfs, high fluctuation, minimum; ramping, low increase, high decrease. 3000 cfs constant (impact analysis) 15,000 cfs constant 3000 cfs constant (impact analysis) Normal summer opertions discharges (11-18 days) 3000 cfs constant (impact analysis) (This could be a breaking point if the summer research discharges were scheduled during 1990 and 1991.) Discharge E: 3000-26,200 CfS, high fluctuation, low minimum; ramping, high increase, high decrease. 3000 cfs constant (impact analysis) DisCharge F: 10,000-33,200 cfs, high fluctuation, high minimum; ramping, high increase, low decrease. 3000 cis constant (impact analysis) Discharge G: 10,000-33,200 cfs, high fluctuation, high minimum; ramping, high increase, high decrease. 3000 cfs constant (impact analysis) July 16-25 10 July 26-29 Ll July 30- " Aug. 9 Aug. 10-12 ~ Aug. 13-22 10 23-26 Li Oct. 1-10 \0 11-14 Y Oct. 15-24 10 25-28 ~ Normal fall operations discharges (this time period may be exchanged for the November 22 time period. ) 3000 cfs constant (impact analysis) 8000 cis constant 3000 cfs constant (impact analysis)