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<br />9 <br /> <br /> <br />was an item needed for estimating salt pick-up in Lake Powell. <br /> <br />~. Thus, this ite~which was estimated by mass balance, was an off- <br />W <br />,,~ <br />t-~ 3hoot of the salt pick-up study. . <br /> <br />In the Forum salt routing studies, a bank storage amount <br /> <br />equal to 10 percent of the change in surface storage was assumed. <br /> <br />If storage increased, it was assumed that water went into bank <br /> <br />storage and, if storage decreased, it was assumed that water <br /> <br />came out of bank storage. However, mass-balance computations <br /> <br />indicated that water going into bank storage has historically <br /> <br />been greater than 10 percent and that water went into bank storage <br /> <br />even during periods of declining water surface storage. <br /> <br />Figure 10 shows the relationship between historical bank <br /> <br />storage and changes in surface storage. Due to the mass-balance <br /> <br />cpproach, the relationship is poor. However, the relationship is.. <br /> <br />probably a better indication of existing average conditions than <br /> <br />the assumption used for the 1975 and 1978 Forum studies. <br /> <br />Including this relationship in the routing studies, would <br /> <br />cause water shortages in the Lower Basin, if they occur, to occur <br /> <br />, 1,- <br /> <br />, <br />