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<br /> <br />002)52 <br /> <br />. <br /> <br />demand. If the available volume is less than the demand, <br />the amount of water to be released from each reservoir is <br />updated by the available water VVT. The procedure is again <br />applied, the technique being repeated until all demands <br />are met or all reservoirs are at dead storage levels. When <br />all reservoirs are at the same RATIO, the value of VRATIO <br />is identical to it. <br /> <br />When the above process is completed, the computed releases <br />are made from each reservoir and routed downstream to the <br />point of demand. If the full release cannot be made from <br />a reservoir or cannot be routed through a downstream <br />reservoir to the demand point because of capacity constraints, <br />the reservoir making the release is removed from the list <br />of available reservoirs. <br /> <br />. <br /> <br />The portion of the demand that was not met is accumulated and <br />is used as the new demand. The entire procedure is then <br />repeated using the available reservoirs. Should the entire <br />demand remain unsatisfied when there are no longer any <br />available reservoirs, a deficit flow results in the element <br />containing the demand. <br /> <br />A little consideration shows that the above method of computing <br />the RATIO and VRATIO is applicable when V>Vsc. Although <br />in this case the ratio will be greater than I, there is no <br />restriction on the method. <br /> <br />IRRCD=3, control zone operation. - This method is similar to <br />that used for balanced operations. However, rather than <br />dealing with a single zone extending from the top of the dead <br />storage pool to the spillway crest, up to five levels may be <br />specified (Card 9-3) to divide the reservoir into as many as <br />six zones. Releases are adjusted so that water levels are in <br />the same zone in each reservoir, and so that the same portion <br />of the zone is filled in a manner similar to balanced <br />operations. <br /> <br />Referring to Figure (4a), the bottom zone extends from the top <br />of the dead storage pool to the first control level, VOLCT(I). <br />The second zone extends from VOLCT(l) to VOLCT(2), etc. The <br />highest zone uses the highest control zone level as a lower <br />limit but has no upper limit. <br /> <br />. <br /> <br />Adjacent levels may be identical, thus defining a zone of <br />zero volume as shown in Figure (4a). In addition, the lowest <br />level may coincide with the top of the dead storage pool. <br />When a logical analysis of the input data is requested, levels <br />below the top of the dead storage pool are set equal to that <br />level. <br /> <br />2-10 <br /> <br />