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<br />. <br /> <br />~ <br />-.J <br />~ <br />w <br /> <br />. <br /> <br />. <br /> <br />These measurement data served a useful purpose as a check on depths <br />and velocities for different stage-discharge relationships as esti- <br />mated using the model. Seldom was it found desireable, however, to <br />use the cross-section at the gage as one of those taken for stream <br />simulation, since the configuration of the streambed at a gage site <br />is generally more or less atypical of the general stream conditions. <br /> <br />3. Sediment and Temperature Data <br /> <br />This information is included as part of the physical data require- <br /> <br />ments presented <br /> <br />in table 3, page <br /> <br />15, reference <br /> <br />(1) <br /> <br />I twas <br /> <br />requested from USGS (Reston, VA) along with data on historic flow <br /> <br /> <br />records. The data received, however, were so perfunctory as to have <br /> <br />little value. <br /> <br />Sediment and temperature parameters, of course, are not yet an <br />intrinsic part of the model, although it is only a matter of time <br />before they will be. In cold and coolwater streams, depletion of <br />flows can have a particularly adverse impact in that water tempera- <br />tures of low flows fluctuate very nearly as much as the ambient air <br />temperatures do. Maximum/minimum air and water temperatures are <br />thus more meaningful than mean monthly values. In only rare <br />instances, however, have these been taken. <br /> <br />The water quantity vs. quality relationship aspects of the assess- <br />ment were analyzed on the bas i s of the Council on Envi ronmenta 1 <br /> <br />Quality's UPGRADE (User Prompted Graphic Data Evaluation) system to <br /> <br />37 <br />