7423

• UCREFRP Catalog Number: 7423
• Author: U.S. Bureau of Reclamation.
• Title: Glen Canyon Environmental Studies Draft Report, September 1987.
• USFW Year: 1987.
• USFW - Doc Type: Washington, D.C.
• Copyright Material: NO

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TABLE OF CONTENTS

Section I:

Introduction

. . . . . . . .

A-5

Sediment-Dependent Resources . . . . A-5
Study Objectives . . . . . . .. A-13
Study Design . . . . . . . .. . A-13
Major Findings Related to Objectives A-17
Other Major Findings . . . . . . A-19
Organization of Report . . . . . . . A-20

Section II: Sediment Transport and Storage . . . A-21

Sand Transport and Storage . . . . . A-21
Tributary Delivery . . .. ... A-26
Processes in Main Channel Pools . . . A-30
Processes in Recirculation Zones . . A-33
Processes at Rapids . . . . . .. A-39
Response of Sediment to Floods . A-41
Response of Sand Deposits
to Fluctuating Flows . . .. . A-45

Section III: Impacts of Current Operations . .

A-51

Current Operations Defined
Floods . . . . . . . .
Fluctuating Flows . . . . .

A-51
A-51
A-52

Section IV: Impacts of Modified Operations

. A-53

Rating System for Evaluating Impacts A-53
Minimize Loss of Camping Beaches A-54
Benefit Humpback Chub . .. ... A-56
Benefit Common Native Fish . . . . . A-56
Benefit Trout . . . . . . . .. . A-56
Benefit Recreation . . . . . . . . . A-56
Mimic Pre-Dam Flows . . . . . . . . . A-57
Increased Powerplant Releases . . . . A-57

Section V:

Data Gaps and Uncertainties

. . A-59

Amount of Sand Stored .
Sand Transport . . . . .
Predictive Models ...
Sand Exchange . . . . . . .
Sand Delivery . . . . . . .
Debris Flows . .. ...

. .. A-59
. . . . A-60
. . . . . A-60
. A-61
. . . A-61
. . . . A-62

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