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<br />/) '"O! ') <br />I Vi 0 t_, <br /> <br />River <br /> <br />Percent explained variance <br />Linear Second degree <br /> <br />Green <br />Colorado <br />San Juan <br /> <br />87.S <br />81.1 <br />92.8 <br /> <br />87.6 <br />81.1 <br />95.5 <br /> <br />Although the fit is better for the second degree relationships, the <br />linear relations were used because they are simpler to apply. Uncer- <br />tainties involving the actual distribution of the increased flows <br />during the year, as well as those surrounding separation of stream- <br />flows into base and surface components are considered to be equally <br />significant. The resulting relations between the salt mass in <br />1,000 tons and the flow in 1,000 acre-feet are of the form: <br /> <br />River <br /> <br />Intercept <br />1,000 tons <br /> <br />Slope <br />tons/acre-foot <br /> <br />[" <br />" <br />I <br />! <br />I <br />i. <br /> <br />SALT = INTERCEPT + SLOPE X FLOW <br /> <br />Specifically: <br /> <br />Green <br />Colorado <br />San Juan <br /> <br />343.8 <br />2,321 <br />312.3 <br /> <br />0.5994 <br />0.4004 <br />0.4304 <br /> <br />Increases in the river's salt load are computed as the slope times <br />the increased flows. <br /> <br />~ <br /> <br />I. <br /> <br />In order to investigate the effect of the monthly distributions on <br />the results at Imperial, two distributions of the total annual increases <br />of flow and salt were used: <br /> <br />Uniform - A uniform daily rate was assumed, resulting in <br />different percentages for each month due to <br />differing lengths of each month. <br />Spring runoff - The mean monthly present modified flows at each <br />upstream boundary station, Appendix A, were <br />inspected. Spring runoff was indicated during <br />March-July. Without separating base flow and <br />surface runoff, percentages were calculated each <br />month using that month's flow to the sum of the <br />Harch-July flows. <br /> <br />c- <br /> <br />Percentages corresponding to these distributions are given in Table XV. <br />They were applied to both flow and salt increases. This is equivalent <br />to assuming a constant concentration, equal to the slope of the linear <br />relations, for every month. <br /> <br />32 <br />