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<br />. <br /> <br />There are 65 RAA's and they conform very closely to those water resource <br /> <br /> <br />areas established by the WRC which are hydrologically-oriented, as are <br /> <br /> <br />the RAA's. There are four sets of these WRC areas, designated as <br /> <br />..... <br />-.J fo llows: <br />r-.J <br />....... <br /> <br />. <br /> <br />. <br /> <br />1. Water Resource Regions (WRR' s), based on major drai nage basins - 18 <br /> <br />2. Aggregated subregions (ASR's) - 99 <br /> <br />3. Subregions (SR's) - 204 <br /> <br />4. Accounting Units (AU's) - 332 <br /> <br />Each RAA thus includes a portion of a Water Resource Region that is <br /> <br /> <br />relatively uniform in hydrology, geology, climate, fish and wildlife <br /> <br /> <br />habitat, and recreational potential. Within a specific RAA there should <br /> <br /> <br />be gross similarities of terrain, stream flow, biological communities, <br /> <br /> <br />and recreational resources. Streams of similar size within each RAA may <br /> <br /> <br />be expected to have similar geomorphology, riparian vegetation, fish <br /> <br /> <br />species assemblages, temperature patterns and to present reasonably <br /> <br /> <br />comparable opportunities for similar types of recreational activity. <br /> <br />B. Representative Reach Concept <br /> <br />The closing sentence in the preceding paragraph provides the rationale <br /> <br /> <br />for the representative reach concept. If there are these s i mil ari ties <br /> <br /> <br />between streams of similar size within an RAA, then it follows that one <br /> <br />9 <br />