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<br /> <br />002055 <br />. <br /> <br />, ~ .. <br /> <br />between the spillway and dam crests, the m1n1mum uncontrolled <br />spills must be satisfied.* The additional spills are then <br />the total of the unsatisfied minimum uncontrolled spills and <br />the quantity above the dam crest. <br /> <br />If the spill option is not used, the program checks if the <br />excess water option (subsequently discussed) is to be used. <br />If it is, the quantity of spills is added to any other excess <br />waters which are then released according to excess water rules. <br />When neither the spill or excess water option is used, the <br />total quantity of water is released and routed to the next <br />downstream reservoir or to the downstream boundary if there <br />is none. <br /> <br />. <br /> <br />When the spill option is used, spills are routed to downstream <br />elements containing variable exports. As many as five <br />variable exports may be specified (Card 9-6). Allocation of <br />water between them is based on the size of the spills using <br />a percentage concept (Card 9-7). As many as five separate <br />rules may be used. Details are contained in the subsection, <br />"Reservoir Excess Water and Spill Options - Use of Variable <br />Exports." <br /> <br />ICON(4), excess water option. - This option is similar to the <br />spill option but does not depend on the availability of spills <br />for water to allocate to the variable exports. Instead, time <br />dependent monthly volumes are specified, above which water is <br />considered as excess (Card 9-5). The number of rules, <br />variable exports, and variable export numbers are given on the <br />9-8 Card while the rules are given by the 9-9 Card. Details, <br />almost identical to those for the spill option, are contained <br />in the subsection, "Reservoir Excess Water and Spill Options - <br />Use of Variable Exports." <br /> <br />. <br /> <br />* If the program finds water in the zone between spillway and <br />dam crests, it assumes that water was in this zone for the entire <br />month. The required minimum uncontrolled spill volume is then <br />the product of the daily rate and the number of days in the month. <br />If the release volume is less, then the difference is the additional <br />uncontrOlled release to be made. Now it may occur that only a <br />portion of this amount would put the reservoir below the spillway <br />crest. The program checks for this condition and only releases that <br />portion. ObviOUSly, the state of the reservoir during this transition <br />depends on details during the month. The basic monthly time frame is <br />not adequate and the program approach constitutes an approximation of <br />the true situation. <br /> <br />2-13 <br /> <br />(rev. 07/75) <br /> <br />