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<br />1S that the representative reach is chosen for its ability to provide <br /> <br />pertinent information regarding a given set of questions for the entire stream <br /> <br />segment which it represents. Relationships defined between streamflow and <br /> <br />physical habitat conditions at the study site are considered to be indicative <br /> <br />of interactions existing throughout that river segment. <br /> <br />t <br /> <br />Application of the Methodology <br /> <br />The incremental methodology is intended to be used in those instances <br />where the amount of streamflow is the dominant determinant of the abundance of <br />a target organism and the determination of a streamflow requirement 1S a <br />central question. It is also understood that streamflow conditions are <br />compatible with the theoretical basis of the hydraulic models (i.e,) steady <br />flow within a rigid boundary) and that the habitat suitability curves are <br />acceptable indications of an individual species preferred habitat conditions. <br />Once it has been determined that flow regime is the dominant driving <br />variable and the stuay site(s) has been selected, standard surveying and <br />stream measuring techniques are employed to obtain calibration data for IFG's <br />hydraulic simulation models, Transects are placed to characterize both <br />hydraulic and instream resource (fishery habitat) conditions. Detailed <br />information is obtained on the stream channel geometry and hydraulic <br />conditions using a multiple transect approach for microhabitat description. A <br />discussion of the theory and field techniques associated with the Instream <br />Flow Group's hydraulic simulation models can be found in Bovee and Milhous <br />(1978). <br /> <br /> <br />Computer programs are available which use these data to predict hydraulic <br /> <br />parameters (depth and velocity) with respect to any described substrate <br /> <br />30 <br />