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<br />, . <br /> <br />8 <br /> <br />15. Calculate changes in recreation potential, <br /> <br />. <br /> <br />16. Interpret technology impacts on representative river reaches. <br /> <br />a. Life stage of target species. <br />b. Standing crop of target species. <br />c. Recreation potential. <br />d. Recreation demand/supply. <br /> <br />17. Compare relative impacts. <br /> <br />a. Compare a single technology among RAA's and WRC <br />regions, <br />b. Compare two or more technologies within RAA's in a sin- <br />gle WRC region. <br /> <br />The different steps in the instream flow analysis are illustrated in <br />Figure 2. <br /> <br />DISCUSSION OF,STEPS IN METHODOLOGY <br /> <br />Establish the Riverine Analysis Areas to be Studied <br /> <br />A total of 65 Riverine Analysis Areas are depicted in Figure 3 super- <br />imposed on the national water data network accounting units of the <br />Water Resources Council. The number of RAA's was kept to a minimum . <br />by miltching subregion and accounting unit boundaries where feasible. <br />Each RAA thus includes a portion of a Water Resource Region (WRR) <br />that is relatively uniform in hydrology, geology, climate, and in fish <br />and wildlife habitat. Within a specifiC RAA, therefore, there should be <br />gross similarities of terrain, stream flow, and biological communities. <br />Streams of similar size within each RAA should then have similarities in <br />stream geomorphology, riparian vegetation, fish species assemblages, <br />and temperature patterns. <br /> <br />I <br /> <br />Most section 13(a) assessments are expected to include two or more <br />WRR's and would therefore involve several RAA's, <br /> <br />Stratify and Sample Streams Within Each RAA <br /> <br />On topographic maps covering the RAA's to be analyzed, mark the loca- <br />tion of all gaging stations and water quantity data records. Such infor- <br />mation can usually be obtained from U. S. G. S. and other federal and <br />state agency files. A large number of federally maintained data bases <br />have been created in the last twenty years, A number of these contain <br />information of use for section 13(a) assessments. Figure 4 and Table 1 <br />provide examples of such gaging station data. Gaging station records <br />are examined to determine streams for which adequate hydrologic data <br />are available. These streams or stream reaches are then stratified into <br />four to six classes of physical stream types. All gaged stream seg- <br />ments are listed numerically by class in tabular form similar to those . <br />