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<br /> <br />'002051 <br /> <br />. <br /> <br />The reservoir or reservoirs having the highest ratio are <br />isolated and the reduction required to lower the ratio <br />to the next highest reservoir or reservoirs is computed <br />as the difference in ratios. From Equation (4): <br /> <br />VRATIO = <br /> <br />RATIO - RATION <br /> <br />(V-Vos) <br />= <br />(VSC-VOS) - <br /> <br />(VN-VOS) <br />(V sc-v OS) <br /> <br />from which <br />v-v <br />_ N <br />VRATIO - V -v <br />SC OS <br /> <br />or <br /> <br />vv = VRATIO (VSC-Vos) <br /> <br />where VRATIO is the required reduction in the <br />RATIO of the highest reservoir to <br />make it identical with the next <br />highest reservoir (dimensionless) <br /> <br />(5) <br /> <br />.0 <br /> <br />RATION <br />VN <br /> <br />is the surface storage volume <br />corresponding to the reservoir <br />at the next highest ratio <br /> <br />(L 3) <br /> <br />is the next highest ratio <br /> <br />(dimensionless) <br /> <br />vv is the change in surface storage <br />volume in going from the present <br />level to the level corresponding <br />to the next highest ratio (L3) <br /> <br />To obtain the total available volume including bank storage <br />in going to the next highest ratio, Equation (5) is modified <br />to: <br /> <br />VVT = VRATIO (VSC-VOS)(I+BANK) <br />where VVT is the total change in volume <br /> <br />(6) <br />(L 3) <br /> <br />. <br /> <br />If there are several reservoirs with the same ratio, each <br />VV is computed and all .are summed to yield the total <br />avIilable volume to draw the reservoirs down to the next <br />highest level. If this volume exceeds the demand, the <br />total release is set equal to the demand and each reservoirs <br />release is reduced by the same percentage to yield the <br /> <br />2-9 <br /> <br />(rev.'07/75) <br /> <br />