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WSP08046
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Last modified
1/26/2010 2:29:55 PM
Creation date
10/12/2006 2:44:34 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09.A
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
7/5/1998
Title
CWCB Agenda Item #4, May 14-15-1988-Board Meeting - Glen Canyon Dam Environmental Studies
Water Supply Pro - Doc Type
Board Memo
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<br />;,,,-~~,, <br /> <br />!.;;,-~ <br />-~~g1 <br /> <br />time ot the year strand fish. Fluctuations during the <br />summer months reduce habitat for larval native fishes. <br />Fluctuations in the winter months reduce the natural <br />reproduction ot trout by exposing spawning beds and <br />denying access of reproducing adults to tributaries. <br />However, short periOdS of fluctuations at other times <br />may increase food availability and trout growth. <br /> <br />Seaches deposited during high, steady flows are rapid~y <br />eroded when exposed to either fluctuating or steady <br />lower flows, but the rate ot erosion diminishes and <br />. equilibrium is reached atter several years ot similar <br />releases, The stable beach area that develops in <br />response to fluctuating flows is smaller than that <br />developed during steady flows ot the same annual <br />volume, and could be substantially smaller depending <br />upon release patterns. <br /> <br />MOditied operations Could Protect Or Bnhance <br />Most ae.ouees <br /> <br />The GeES found that changes in operation of the dam to <br />re~uce fluctuations and avoid flood releases could <br />reduce the resource losses occurring under current <br />operations and, in some cases, even improve the status <br />of the reSources, Five modified patterns of op- <br />erations were designed, each to address one or more <br />critical resources. These patterns have been con- <br />strained only by the need to release a minimum of 8.23 <br />million acre feet (mat) per year, maintain minimum <br />flows of 1,000 cts in winter and 3,000 cfs in summer, <br />and stay within the desiqnated powerplant capacity of <br />31,500 cfs. These modifications only approximate ideal <br />release patterns for individual downstream resources. <br />They illustrate the types of changes that would protect <br />or enhance resource., but do not represent the full <br />range of possible options. These modifications should <br />nc~ be ~onsidarBd as tully develoned or recQmmended <br />on.ra~ional schamas. <br />
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