|
<br />LAKE POWELL
<br />(COLORADO RIVER)
<br />
<br />
<br />Water Year 1992
<br />
<br />Lake Powell, which is impounded by Glen Canyon Dam, is
<br />operated as part of the Colorado River Storage Project
<br />(CRSP) in accordance with governing compacts and laws to
<br />provide conservation storage, river regulation, power
<br />generation, recreation, and fish and wildlife enhancement.
<br />
<br />Lake Powell began water year 1992 at elevation 3628.5 feet
<br />with a live content of 14,694,700 acre-feet (60 percent of
<br />capacity). April through July unregulated inflow to Lake
<br />Powell was 4,199,000 acre-feet (52 percent of average). Total
<br />unregulated inflow into Lake Powell in water year 1992 was
<br />7,202,000 acre-feet, only61 percent of the 11,900,000 acre-feet
<br />unregulated average. Actual regulated inflow for water year
<br />1992 was 7,657,000 acre-feet. Regulated inflow to Lake Powell
<br />peaked at 32,000 cubic feet per second on June 1, 1992.
<br />
<br />Beginning on August 7, 1991, test interim minimum and
<br />maximum releases and controlled fluctuations were
<br />established below Glen Canyon Dam, pending development
<br />
<br />Water Year 1993
<br />
<br />ACTUAL RELEASES 1992
<br />
<br />THOUIAHD ACRE-FEET
<br />1200
<br />
<br /> ~
<br /> ./ '" /
<br />/' ./
<br />
<br />1000
<br />
<br />.00
<br />
<br />..0
<br />
<br />'.0
<br />
<br />200
<br />
<br />o
<br />,p +0" 9+'(, ~+ 4'-. +"~ l" +~ ~+ ~.. ~o 'of/}
<br />
<br />and implementation of the interim criteria on November I,
<br />1991. The interim criteria are intended to reduce the effects
<br />of power operations on downstream natural resources until
<br />the Glen Canyon Environmental Impact Statement is
<br />completed. Lake Powell has a minimum objective annual
<br />release of 8,230,000 acre-feet, as set forth in the Operating
<br />Criteria. The delivery of the 8,230,000 acre-feet, coupled with
<br />continued below normal inflow, reduced live storage at the
<br />end of water year 1992 to 14,085,100 acre-feet (58 percent of
<br />capacity). The reservoir elevation on September 30, 1992 was
<br />3623.0 feet, 77 feet below the maximum pool elevation of 3700
<br />feet.
<br />
<br />The years 1987 through 1992 have been the lowest 6
<br />consecutive years of inflow into Lake Powell on record.
<br />Maintaining the minimum release objective of 8,230,000
<br />acre-feet annually from Lake Powell as set forth in the
<br />Operating Criteria during these years has reduced the
<br />reservoir storage by 9,800,000 acre-feet.
<br />
<br />LAKE POWELL
<br />
<br />Reservoir
<br />
<br />Acre-feet
<br />
<br />Elevation, feet
<br />
<br />Storage Capacity
<br />Rated Head
<br />Minimum Power
<br />Surface Area, full
<br />Reservoir Length, full
<br />
<br />24,322,000
<br />9,428,000
<br />4,126,000
<br />
<br />3700
<br />3570
<br />3490
<br />161,390 Acres
<br />186 Miles
<br />
<br />Power plant
<br />
<br />Number of Units
<br />Total Capacity
<br />
<br />8
<br />1,247,000 KW
<br />
<br />13
<br />
<br />,
<br />" tit,. N\15.51,.J~
<br />
|