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<br />"'" <br />i;.O <br />L'" <br />C.> <br />-:-J <br /> <br />,.~'-, <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />CHAPTER II <br /> <br />GRAND VALLEY RIVER BUDGET <br /> <br />unaccounted flow is due to errors in estimating budget comp"nents with <br /> <br />associated salt (i.e., ground water outflow or streamflow), then ignoring the <br /> <br />discrepancy is the same as ignoring a salt outflow, which l,~ads to an <br /> <br />underestimation of salt pickup, <br /> <br />A procedure has been developed to adjust the IOOdel to c:orrect for <br /> <br />unaccounted flow. The adjustment scales the river inflows one-way and the <br /> <br />river outflows the other, such that the resulting unaccountE!d flow is zero. <br /> <br />The adjustment eliminates any ignored salt outflow. Of course, the exact <br /> <br />contribution of each of the inflows and outflows to the unaccounted flow is <br /> <br />still unknown, but since the quality of river and/or ground water outflows is <br /> <br />not greatly different from the quality of the river inflows, it makes little <br /> <br />difference. <br /> <br />The effect on the salt pickup of varying the amount of unaccounted flow <br /> <br />designated to each budget component depends on the TDS of that component. <br /> <br />The adjustment can be thought of as creating another outflo.' equal to the <br /> <br />unaccounted flow. The quality of this ficticious outflow is equal to the <br /> <br />flow weighted mean of the component qualities. Therefore, the greatest <br /> <br />upward effect in salt pickup would result from applying all of the <br /> <br />unaccounted flow to the worst quality component, and inversely, the <br /> <br />greatest downward effect would result from applying all of the unaccounted <br /> <br />flow to the best quality component. The worst quality component in the State <br /> <br />Line budget that can possibly be responsible for the unaccounted flow is the <br /> <br />Colorado River near State Line. <br /> <br />The difference in the mean annual salt pickup between applying all <br /> <br />unaccounted flow to State Line, as opposed to 50 percent to inflows and 50 <br /> <br />II-12 <br />