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WSP08403
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Last modified
1/26/2010 2:48:02 PM
Creation date
10/12/2006 2:58:08 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.17
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
1/1/1999
Author
BOR
Title
GCD Modifications to Control Downstream Temperatures: Plan and Draft Environmental Assessment
Water Supply Pro - Doc Type
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<br />TABLE OF CONTENTS <br /> <br />CHAPTER I - PURPOSE OF AND NEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . I <br /> <br />INTRODUCTION .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I <br />LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 <br />PURPOSE AND NEED FOR ACTION ................................ 2 <br /> <br />AUTHORITY .................................................... 4 <br />PERMITS REQUIRED .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 <br />SCOPING SUMMARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 <br />PREVIOUS AND RELATED EXPERIENCES .... . . . . . . . . . . . . . . . . . . . . . . 6 <br />Glen Canyon Dam Outflow Temperature Control Study . . . . . . . . . . . . . . . 6 <br />Flaming Gorge Outflow Temperature Control. . . . . . . . . . . . . . . . . . . . . . . 6 <br />Shasta Dam Outflow Temperature Control Study ....................7 <br />Hungry Horse Dam Selective Withdrawal System . . . . . . . . . . . . . . . . . . . . 8 <br />Other Selective Withdrawal Systems .............................. 8 <br /> <br />CHAPTER II - DESCRIPTION OF ALTERNATIVES ................. 9 <br />NO-ACTION AL TERNA TIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 <br />ACTION ALTERNATIVE (Temperature Control Modifications) . . . . .. . .. . ..9 <br />Role of Adaptive Management in Operations.. . .. . . . . . . .... . ... . .. .10 <br />Glen Canyon Adaptive Management Process. . . . . . . . . . . . . . . . . . . . . . . 12 <br />Proposed Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 <br />Proposed Schedule for Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 <br />Annual Operation and Maintenance Costs. . . . . . . . . . . . . . . . . . . . . . . . . 14 <br />ALTERNATIVES CONSIDERED BUT ELIMINATED.................. 15 <br />Navajo Powerplant Alternative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 <br />Hold the Reservoir at Minimum Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 <br />Minimize Summer Releases to Increase Warming of the River. . . . . . . . .15 <br /> <br />Dam Removal.. .. . .. . .. . ... .. . ., . ... .. . .. . . .. . . ... . . . .. . .. . .15 <br />Fund other Recovery Efforts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 <br />Reservoir Destratification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 <br />DESIGN ALTERNATIVES CONSIDERED........................... 16 <br /> <br />CHAPTER III - AFFECTED ENVIRONMENT AND ENVIRONMENTAL <br />CONSEQUENCES .............................................. 23 <br />COLORADO RIVER ECOSYSTEM RESOURCE LINKAGES. . . . . . . . . . . . 23 <br />CONSTRUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 <br />WATER QUALITY AND AQUATIC RESOURCES.................... 24 <br />River Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 <br />Lake Temperatures ...........................................25 <br />Reservoir Evaporation ........................................ 28 <br /> <br />Salinity .................................................... 28 <br />Selenium .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 <br />Nutrients and Their Effects on Primary Productivity . . . . . . . . . . . . . . . . . 29 <br />Native and Endangered Fishes .................................. 33 <br />Non-Native Fishery Below Dam ................................ 35 <br /> <br />VI <br />
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