9370

• UCREFRP Catalog Number: 9370
• Author: Colorado Water Workshop.
• Title: 1996 Colorado Water Workshop.
• USFW Year: 1996.
• USFW - Doc Type: Western State College of Colorado.
• Copyright Material: NO

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Releases from Lake Powell in water year 2000 will continue to reflect consideration of the uses
and purposes identified in the authorizing legislation for Glen Canyon Dam. Power plant releases
and Beach/Habitat Building Flows will reflect criteria based on the findings, conclusions and
recommendations made in the Record of Decision for the GCDFEIS pursuant to the Grand
Canyon Protection Act of 1992.

Daily and hourly releases will continue to be made according to the parameters of the ROD for
the GCDFEIS preferred alternative, and published in the Glen Canyon Dam Operating Criteria
(62 Fed. Reg. 9447, Mar. 3, 1997), as shown in the following table:

a e en anyon am re ease restnctlons
Parameter (cms) (cfs) conditions
Maximum flow (1) 708.0 25,000
Minimum flow 141.6 5,000 nighttime
226.6 8,000 7:00 am to
7:00 pm
Ramp rates
ascending 113.3 4,000 per hour
descending 42.5 1,500 per hour
Daily fluctuations (2) 141.6/226.6 5,000 / 8,000

T bl 3 GI C D

(1) to be evaluated and potentially increased as necessary and in years when delivery to the
Lower Basin exceeds 10,152 MCM (8.23 MAF)

(2) Daily fluctuations limit is 141.6 cms (5,000 cfs) for months with release volumes less
than 740 MCM (.600 MAF); 169.9 cms (6,000 cfs) for monthly release volumes of 740 to
987 MCM (.600 to .800 MAF); and 226.6 ems (8,000 cfs) for monthly volumes over 990
MCM (.800 MAP)

December 1, 1999

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