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.,.;:& ~.~~1 ,;.:..-. CHAPTER II ~ 0", <:.if ~) GRAND VALLEY RIVER BUDGET percent to State Line is less than four percent. On the other hand, the best quality components are precipitation and consumptive use. Precipitation, however cannot be responsible because it is measured and small, and cannot reasonably be off by 60%. Nor can the consumptive use be soley responsible because some years have an unaccounted flow nearly as .large as the consumptive use, and a near zero value of annual consumptive use is unreasonable. Nevertheleas, it is informative to allocate all of the unaccounted flow to consumptive use to establish a mBXimum possible downward effect of the flow adjustment on salt pickup. The result of allocating all unaccounted flow to consumptive use is the r..',-:~,,:.~ same as not adjusting the flow at all (see Tables 4 and 5, and Figure 4). A better method of investigating the effect of the consumptive use estimates is to scale ~p the consumptive use such that the resulting average unaccounted flow is zero (see Tables 6-9). Hence, some years will have positive unaccounted flow and some negative, but the average will be zero. To this end, all monthly consumptive use values were scaled up by 20.93%, and then for the sake of analysis, scaled down by the same percentage. The resulting consumptive use estimstes are thought to.be conservative upper and lower bounds of the actual value. The mean annual salt pickup values using these bounds on consumptive use are represented by the innermost pair of lines straddling the best estimate mean in Figure 5. For all this, there is no reason to believe that the original estimate of consumptive use is incorrect, II-13