Investigation into Methods for Developing a Physical Analysis for Evaluating Instream Flow Needs.

摘要

Numerous disciplines have been working for many years to develop methods whereby the needs of instream uses such as fisheries,recreation,and wildlife can be evaluated in terms of incremental reduction in available stream flow. A basic problem has been the lack of capability to quantify relationships in terms other than primary,such as habitat versus discharge. This report presents a sample of such methodologies,places them in the context of the total watershed,river channel,and stream flow system,and develops a 'severity factor'method for quantifying flow reduction effects in terms of the physical system. Fisheries literature is used as the data source to test and confirm the 'severity factor'method. This report has been prepared with water resource managers in mind as primary users of this information.