Title

Evolution and Application of Instream Flow Methodologies to Small Hydropower Developments: An Overview of the Issues

Publication Date

1985

Notes

ISBN 0-913235-37-7

Publication Title

Proceedings of the Symposium on Small Hydropower and Fisheries

Start Page

176

End Page

183

Editors

Olson FW;White RG;Hamre RH;

Publication Place

Bethesda, MD

Publisher

American Fisheries Society

Abstract

Methods for evaluating instream flow needs have evolved over the last 30 years resulting in two categories which are defined as 'standard-setting' and 'incremental.' Standard-setting methodologies refer to those measurement and interpretive techniques designed to generate a flow value(s) which is intended to maintain the fishery at some acceptable level. Incremental methodologies on the other hand are organized and repeatable processes by which: (1) a fishery habitat/streamflow relationship and the hydrology of the stream are transformed into a baseline habitat time series; (2) proposed water management alternatives are quantified and compared with the baseline; and (3) project operating rules are negotiated. A hierarchical approach to small-hydro instream flow analysis is suggested.

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