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<br />" <br /> <br />. <br /> <br />o INTRODUCTION <br />OJ <br />CJl This report and the proposed methodology were developed by the U. S, <br />....l Fish and Wildlife Service (FWS) on the basis of a Memorandum of Agree- <br />ment between the Water Resources Council (WRC) and FWS, dated <br />August 31, 1976. WRC was sponsored by the Energy Research and <br />Development Administration (ERDA) for work under section 13(a) and <br />funded by ERDA under section 16 of the Federal Nonnuclear Energy <br />Research and Development Act of 1974. ERDA became part of the De- <br />partment of Energy (DOE) in October 1977 and no longer exists as an <br />entity. <br /> <br />With this methodology, the relative impacts of developing new energy <br />technologies upon fish and recreation potential in stream reaches located <br />in different areas of the United States can be evaluated without the <br />delay of obtaining site-specific data. Such a methodological approach <br />conforms to the requirements of section 13(a). <br /> <br />The methodology makes use of Riverine Analysis Areas (RAA's), a Rep- <br />resentative Reach Concept, Target Fish Species, Recreational Activities, <br />Probability of Use Curves, and Simulation Modeling Techniques. This <br />report is an expository treatment for understanding the process. <br /> <br />. <br /> <br />Information for this methodology, has been drawn in part from a report <br />prepared under Contract 14-16-0008-2157 for the Fish and Wildlife Ser- <br />vice by the Pan Technology Consulting Corporation, 1725 K Street <br />N.W., Washington, D.C 20006. The methodology is intended to alert <br />decision-makers to the nature and relative impact of the water require- <br />ments and associated activities of developing new energy technologies on <br />a range of stream sizes in alternative RAA's, or of two or more technol- <br />ogies with RAA's. The conterminous United States was classified into <br />65 substantially homogeneous areas, termed Riverine Analysis Areas. <br />River reaches within these RAA's are categorized into ordered hierar- <br />chies related to stream character and watershed size. In exercising the <br />methodology, selected target species, assigned to the various RAA' s, <br />serve as the focus of analyses. The present effort is limited to the <br />flowing stream reaches and their associated target species and recrea- <br />tional activities. <br /> <br />This volume is particularly concerned with the evolution of the RAA's, <br />the representative river reach concept and stratified sampling, and sel- <br />ection of a first generation of target species and activities. It contains <br />a description of the critical habitat parameters incorporated into the <br />model. The simulation techniques for modeling impacts upon fish micro- <br />habitat and recreation potential are then developed. The habitat im- <br />pacts are derived by comparing probability of use curves for selected <br />fish species and recreation activities with existing and changed flow <br />conditions. <br /> <br />. <br /> <br />The modeling task was directed to the definition of these inputs in math- <br />ematical terms, to the description of the required calculations, and to <br />