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<br />Q =9.32Q +26.23. <br />p 0 <br /> <br />The standard error of estimate is 18.55 ft3/s. <br />period of record was available for the ~ast output <br />below diversion, near Hayden. <br /> <br />(11) <br /> <br /> <br />002412 <br /> <br />No continuous-discharge data were available for output node 20, Trout <br />Creek above Milner, but instantaneous-discharge measurements made in 1981 and <br />1982 were included (Maura, 1983). These measurements were made concurrently <br />with instantaneous-discharge measurements at Trout Creek near Oak Creek. The <br />regression equation of these concurrent measurements is: <br /> <br />Q =1.05Q +5.57, (10) <br />p 0 <br /> <br />which was used to estimate discharge at Trout Creek above Milner. The stand- <br /> <br />ard error of estimate is 8.997 ft3/s. <br /> <br />All major tributaries of Trout Creek have streamflow-gaging stations <br />(fig. 1). Therefore, the data estimated for node 20, Trout Creek above <br />Milner, were compared to the streamflow records from these tributaries. A <br />satisfactory estimate of discharge Was obtained from equation 10, except <br />during the peak-flow months of Ilarch, April, and I~y. To improve timing for <br />data for node 20, mean monthly discharge for March, April, and May was <br />estimated for Trout Creek from data for Foidel Creek at mouth, near Oak Creek <br />from the equation: <br /> <br />Gaged data for the entire <br />node, node 27, Yampa River <br /> <br />Water Quality <br /> <br />Analyses of instantaneous water-quality samples of dissolved-solids <br />concentration are available for most streamflow-gaging stations in the study <br />area. In addition, instantaneous measurements of discharge and associated <br />dissolved-solids concentration are available from a previous study for a <br />number of miscellaneous sites in the stream system (Maura, 1983). Data were <br />analyzed in the same way for both streamflow-gaging stations and miscella- <br />neous sites. <br /> <br />For each input node, a linear-regression equation was obtained between <br />the logarithm of instantaneous discharge and the logarithm of dissolved- <br />solids concent~ation. These equations are of the form of equation 4, and the <br />regression equations are given in table 2. These equations were placed <br />directly into the model for each input node. <br /> <br />For each output node with mean monthly discharge data (either observed <br />or extrapolated), a linear-regression equation between the logarithm of <br />instantaneous discharge (cubic foot per second) and dissolved-solids concen- <br />tration (milligram per liter) was obtained from data available at the sites. <br />These equations are of the form of equation 4, and are given in table 3. <br /> <br />12 <br />