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Ou205~ . Reservoir Inputs - Control Options Six reservoir options are available to provide additional flexibility in reservoir operations. They are specified through use of the con- trol option array, ICON(I) of Card 9-1. '. ICON(1), variable constraint option. - Through the use of this option, variable constraint volumes may be specified which act as lower limits for releases from storage. These constraint volumes are time dependent, being specified for each month by the 9-4 Card. When the variable constraint volumes are less than the dead storage pool, they have no effect on operations. When they are greater they prevent releases from storage when- ever the reservoir level falls below them. In this case, the maximum capacity is not altered and flows may be routed through the reservoir providing sufficient capacity exists. If the variable constraint volume exceeds the spillway crest volume, it is reduced to the crest volume. Proper use of this option prevents premature seasonal lowering of the reservoir that could result in shortages during subsequent months. . ICON(2), flood zone override. - A flood zone volume, marking the lower limit of the flood zone which extends upward from it, is specified on the 9-2 Card. It is considered a single valued constant which is independent of time. When releases are made using the percentage allocation (IRRCD=1) it has no effect. However, when either balanced operations (IRRCD=2) or control zone operations (IRRCD=3) are used, it acts to override other operations criteria. / When water levels are in the flood zone, the quantity of water in the flood zone (including bank storage) is accumulated for all reservoirs operating conjunctively. Should this quantity exceed the demand, the same percentage of water in the flood zones of each reservoir is released. If the quantity is less, water in the flood zones is released and the unsatisfied demand is met using the normal methods established by the release rule code. ICON(3), spill option. - After all demands are met and the down- stream boundary has been reached, the program checks the status of each reservoir for additional spills. Starting with the up- stream reservoirs and working downstream, the level in eaeh reservoir is used to determine the size of any required minimum releases. If these are not satisfied, additional releases or spills are required. . If the level is above the dam crest, the entire quantity of water above it must be released. Similarly, when levels are 2-12 (rev. 03/75)