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<br /> <br />002066 <br /> <br />. <br /> <br />(1) Release water using fixed percentages specified <br />by the segment data <br />(2) Base releases on balanced operations <br />(3) Base releases on control zone operations <br /> <br />When the fixed percentages are used and some of the reservoirs <br />are unavailable, only that portion of the demand satisfied by <br />the remaining reservoirs is supplied. Similarly, if any of the <br />remaining reservoirs cannot release their required share due to <br />capacity restraints or if intervening downstream reservoirs <br />restrict routing the releases to the element containing the <br />demand, shortages will result. It is emphasized that releases <br />from the available reservoirs are not increased to reduce this <br />shortage. <br /> <br />. <br /> <br />When either balanced or control zone operations are employed the <br />program first checks if any of the available reservoirs are using <br />the flood zone override option. In using this option, the bottom <br />of the flood zone is specified. Should water levels enter this <br />zone, the reservoir is given preference over all other reservoirs <br />operating conjunctively, regardless of other criteria. When <br />more than one reservoir in a segment is using this option the <br />total volume of water in all the flood zones is computed. If <br />this amount exceeds the demand, the same percentage of the water <br />in each flood zone is released. For example, if the demand is <br />100 and the flood zone volume in Reservoir A is 150 and in B is <br />SO, the percent to release is 100/(150+50) or SO percent. Then <br />the release from A is ISO x 0.5 or 75 and from B SO x 0.5 or 25. <br /> <br />If there are no flood zone releases or if they do not satisfy the <br />demand, the remaining unsatisfied demand is met using normal <br />operating procedures. The technique is to calculate the quantity <br />of water to be released through a series of steps. Actual <br />releases and routing are only performed when releases equal the <br />demand (if possible). For balanced operations, water is released <br />from the reservoir having the highest percentage of water in the <br />active or normal operating zone down to the next highest reser- <br />voir if necessary. Should additional water be required, water <br />is released from both reservoirs down to the next highest reser- <br />voir (or to the dead storage or variable constraint levels). For <br />control zone operations, the procedure is similar except water <br />is released from the reservoir with water in the highest zone at <br />the highest percentage. <br /> <br />. <br /> <br />After the required releases are determined, each reservoir is <br />operated with the releases made and routed to the element con- <br />taining the demand. During these operations, two situations may <br />arise which prevent meeting the full demand: <br /> <br />3-4 <br /> <br />