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<br />002,41'1 <br /> <br />L=Q.C.0.0027.N , <br />m <br /> <br />(12) <br /> <br /> <br />Using these equations, a <br />each mean monthly discharge. <br />(tons per month) was obtained <br /> <br />dissolved-solids concentration was obtained for <br />Calculation of the load of dissolved solids <br />from: <br /> <br />where: L=dissolved-solids load (in tons per month), <br />Q=mean monthly discharge (in cubic feet per second), <br />C=dissolved-solids concentration (in milligrams per liter) at the mean <br />monthly discharge, and <br />N =number of days in the month. <br />m <br /> <br />The calculated values for the period of record are used as the obs~rved val- <br />ues and are compared to modeled values for calibration and error analysis. <br /> <br />No measurements of dissolved-solids concentration are available for in- <br />put node 21, Yampa River at Steamboat Springs, and node 22 on the Elk River; <br />data for node 22 is extrapolated from Elk River at Clark (09241000). This <br />lack of data is unfortunate as these nodes input an average of nearly 90 per- <br />cent of the total volume of water observed at the outlet (node 27). <br /> <br />However, specific-conductance values are available for both stations. <br />For the Elk River at Clark (09241000), there are 41 values for specific con- <br />ductance and instantaneous discharge. These values in a regression yield: <br /> <br />C =188Q-0.152 <br />s ' <br /> <br />(13) <br /> <br />where: C =specific conductance (in micromhos per centimeter at 250 Celsius), <br />sand <br />Q=instantaneous discharge (in cubic feet per second), with a standard <br />error of 35 percent. <br /> <br />For <br />charge. <br /> <br />node 21. there are 44 observations of specific conductance and dis- <br />The regression equation for these data is: <br /> <br />C =1 648Q-0.383 <br />s ' , <br /> <br />(14) <br /> <br />with a standard error of 27 percent. <br /> <br />Hem (1970) suggests that the relation between dissolved-solids concen- <br />tration and specific conductance is of the form: <br /> <br />C=b.C <br />s' <br /> <br />(15) <br /> <br />where: C=dissolved-solids concentration (in milligrams per <br /> <br />C =specific conductance (in micromhos per centimeter <br />sand <br />b=regression coefficient. <br /> <br />liter), <br />at 250 Celsius), <br /> <br />14 <br />