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life stage was assigned a "C-" because of the small sample size (n=21) and <br />limited number of spawning sites. The razorback sucker curve sets were <br />both given a "C" rating, presumably because of small sample size (n ranges <br />from 11 to 32). The ratings are not intended to down grade the curves, <br />but rather they serve as a precaution until further data is collected and <br />existing curves are improved. <br />5. Hydraulic Simulation <br />Knowledge of the magnitude and spatial distribution of point <br />velocities is often essential to biological analysis of riverine <br />environments. The primary purpose of incorporating incremental hydraulic <br />simulation modeling into a study is to make the most efficient use of <br />limited field observations to describe the occurrence of depths and <br />velocities under a broad range of unobserved streamflow conditions. The <br />object of a hydraulic model is to predict: 1) velocities at the selected <br />verticals and the associated cells and 2) water surface elevations at the <br />cross sections, from which depths at the verticals may be determined by <br />subtraction of the bed elevations. The available substrate is then <br />determined by the width of flow over the defined substrate types. <br />In this analysis, the WSE14S, water surface elevation stand alone <br />program, is used to predict the water surface elevations (WSEs) at each <br />cross section at flows of interest based on a regression of the WSEs and <br />discharge measurements collected throughout the summer. The accuracy of <br />the hydraulic simulations is evaluated by the ratio between discharge from <br />the collected field measurements and the discharge simulated by the model. <br />This ratio should range between 0.9 and 1.1 for an acceptable calibration. <br />17 <br />