7924

• UCREFRP Catalog Number: 7924
• Author: Loar, J. M. and M. J. Sale.
• Title: Analysis of Environmental Issues Related to Small-Scale Hydroelectric Development, V. Instream Flow Needs for Fishery Resources.
• USFW Year: 1981.
• USFW - Doc Type: TM-7861, ‎(contract no. W-7405-eng-26)‎,
• Copyright Material: NO

TABLE OF CONTENTS
Section Page
.i

4
4

ACKNOWLEDGMENTS . . . . . . . . . . . . . . . . . . . . . . . i i i
PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
ABSTRACT . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . xi
LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . xi i i
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Historical Background on the Instream Flow Issue . . . 3
1.1.1 Development in the West . . . . . . . . . . . . 3
1.1.2 Development in the East . . . . . . . . . . . . 6
1.2 Environmental Regulations Related to Instream Flow . . 8
1.3 Effects of Hydroelectric Generation on Instream Flow . 10
2. EXISTING METHODS FOR INSTREAM FLOW ASSESSMENT . . . . . . . 17
2.1 Fixed Percentage . . . . . . . . . . . . . . . . . . . 18
2.2 Constant Yield . . . . . . . . . . . . . . . . . . . . 19
2.3 Flow Duration Curves . . . . . . . . . . . . . . . 22
2.4 U.S. Forest Service Habitat Evaluation . . . . . . . . 24
2.4.1 Habitat-Discharge Curves . . . . . . . . . 25
2.4.2 Simplified Staff Gage Analysis . . . . . . . . 27
2.4.3 R-2 Cross . . . . . . . . . . . . . . . . . . . 28
2.5 WSP Hydraulic Simulation . . . . . . . . . . . . . . . 30
2.6 Usable Width . . . . . . . . . . . . . . . . . . . . . 32
2.7 Preferred Area . . . . . . . . . . . . . . . . 36
ix