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 (Continued)
Section Page
2.8 IFG Incremental Methodology . . . . . . . . . . . . . 38
2.9 Summary of Available Methods . . . . . . . . . . . . 47
3. CRITICAL EVALUATION OF EXISTING METHODS FOR INSTREAM
FLOW ASSESSMENT . . . . . . . . . . . . . . . . . . . . . . 50
3.1 Implicit Assumptions . . . . . . . . . . . . . . . . . 52
3.1.1 Hydraulics and Channel Morphology . . . . . . . 52
3.1.2 Biological Response . . . . . . . . . . . . . . 58
3.2 Data Requirements . . . . . . . . . . . . . . . . . . 63
3.2.1 Hydrologic Data . . . . . . . . . . . . . . . . 64
3.2.2 Transect Data . . . . . . . . . . . . . . . . . 67
3.2.3 Habitat Criteria . . . . . . . . . . . . . . . 68
3.3 Costs of Application . . . . . . . . . . . . . . . . . 69
3.3.1 Discharge Approaches . . . . . . . . . . . . 70
3.3.2 Single-Transect, Hydraulic Rating
Approaches . . . . . . . . . . . . . . . . . . 70
3.3.3 Habitat Modeling Approaches . . . . . . . . . . 71
3.4 Decision-Making Capabilities . . . . . . . . . . . . . 73
4. CONCLUSIONS AND RECOMMENDATIONS . . . . . . . . . . . . . . 77
4.1 General Conclusions . . . . . . . . . . . . . . . . 77
4.2 Guidelines for Assessing Instream Flow Needs
Related to Fishery Resources at Small-Scale
Hydropower Sites 78
4.2.1 Levels of Analysis . . . . . . . . . . . . . . 80
4.2.2 Criteria for Selecting Among Levels . . . . . . 83
4.2.3 Applications . . . . . . . . . . . . . . . . . 85
4.3 Planning for Instream Flow Assessments . . . . . . . 90
5. LITERATURE CITED . . . . . . . . . . . . . . . . . . . . . 91
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