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<br />LAKE POWELL
<br />(COLORADO RIVER)
<br />
<br />
<br />ACTUAL RELEASES WY 1989 LAKE POWELL
<br />""",llI'O Reservoir Acre-feet
<br />..
<br />.. Maximum Storage 25,002,000
<br /> Rated Head 9,428,000
<br />.. Minimum Power 4,126,000
<br /> Surface Area, full
<br />" Reservoir Length, full
<br />,. Powerplant
<br />. Number of Units
<br /> Total Capacity
<br />
<br />Water Year 1989
<br />
<br />Lake Powell, which is impounded by Glen Canyon Dam, was
<br />operated as part of the Colorado'River Storage Project
<br />(CRSP) in accordance with governing contracts and Jaws to
<br />provide conservation storage, river regulation, power
<br />generation, recreation, and fish and wildlife enhancement
<br />during water year 1989,
<br />
<br />At the start of water year 1989, Lake Powell was 91 percent
<br />full with an active storage content of 22,747,000 acre-feet at
<br />elevation 3685.6 feet. The most probable operating plan,
<br />based on the October unregulated inflow forecast of10,8 maf,
<br />called fortotal water year releases of8.50 maf. The reasonable
<br />maximum water supply had projected water year releases of
<br />14,10 mafbased on an unregulated inflow of 16,84 maf,
<br />
<br />On January 1. 1989, Lake Powell was at elevation 3679,7 with
<br />an active content of 21,875,000 acre-feet. The January 1
<br />forecast of April through July runoff for Lake Powell was 7,0
<br />
<br />
<br />NDJFMAMJJASO
<br />
<br />maf, or 86 percent of the long-term average, Discharges
<br />during January from Glen Canyon powerplant averaged
<br />12,300 cfs, or 37 percent of maximum capacity, The runoff
<br />forecast for April through July on each succeeding month
<br />declined until, on June 1, it was 3,78 maf, or 46 percent of
<br />average, Subsequently, releases were set at 8.23 maf for the
<br />year to conserve reservoir storage and to meet minimum
<br />objective release requirements, A maximum lake elevation of
<br />3678,6 feet (87 percent full) was reached on June 11 through
<br />June 14, with an active content of 21,715,000 acre-feet. Lake
<br />PoweU received a peak regulated inflow of 18,400 cfs on May
<br />27,
<br />
<br />The total 1989 water year unregulated inflow to Lake Powell
<br />was 6,253,000 acre-feet which is equivalent to 52 percent of
<br />the long-term average, The total water year release below
<br />Glen Canyon was 8,23 maf, All releases were passed through
<br />the powerplant.
<br />
<br />Elevation, feet
<br />
<br />3,700
<br />3,570
<br />3,490
<br />161,390 Acres
<br />186 Miles
<br />
<br />8
<br />1,247,000 KW
<br />
<br />13
<br />
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