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<br />TASK NO: 11 <br /> <br />Aquatic Resource Studies <br /> <br />SUBTASK NO: 11 i <br /> <br />Feasibility Effects Evaluation <br /> <br />PURPOSE: <br /> <br />An evaluation of the project effects on aquatic life is important <br />in determining the feasibility of the project as planned. The <br />evaluation process will summarize the effects of the proposed <br />project and identify major areas of concern. <br /> <br />APPROACH: <br /> <br />Project effects on streamflow requirements for downstream aquatic <br />life may represent a major environmental issue. Specifically, flow <br />and temperature downstream of the mainstem dam may be specified in <br />FERC license articles and the required levels may affect project <br />feasibility. Methodo10gic information will be available by January <br />1988 to conduct an evaluation of streamflow effects on both <br />downstream and upstream reaches. <br /> <br />Comparison of pre- and with-project instream habitat effects may be <br />performed given predicted with-project monthly flow releases. <br />Temperature effects may be incorporated in this evaluation. <br />Agency-proposed levels of acceptable change in stream habitat will <br />be known from the consultation process. Collectively, these <br />information sources will be used to develop evaluation of: 1) the <br />effects of project operation on stream habitat, 2) expected <br />mitigation from changes in project operation, and 3) effects of <br />expected operation changes on project feasibility. <br /> <br />6162a <br /> <br />11-19 <br />