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<br /> <br />. - 002Cl56 <br /> <br />. <br /> <br />ICON(5) , flag volumes. - This option provides a means of <br />flagging the extreme reservoir conditions: <br /> <br />- when the reservoir exceeds the maximum level specified <br />as MAXIMUM FLAG VOLUME on Card 9-2 <br /> <br />- when the reservoir falls below the minimum level specified <br />as MINIMUM FLAG VOLUME on Card 9-2 <br /> <br />At the end of each month's computations, levels in each of the <br />reservoirs using this option are compared to the input values. <br />Required flag messages are then printed on the common output <br />unit. They include the month number, reservoir element number, <br />reservoir identification, surface volume, and the message: <br /> <br />RESERVOIR VOLUME GREATER THAN MAX. FLAG VOL. = <br />or RESERVOIR VOLUME LESS THAN MINIMUM FLAG VOL. = <br /> <br />followed by the corresponding flag volume. <br /> <br />. <br /> <br />ICON(6), reservoir balancing option. - Through the use of this <br />option, two reservoirs may be brought into balance at the end <br />of a month after normal operations are completed and prior to <br />excess water and spill operations. This option is most appro- <br />priate for use with reservoirs using balanced operations <br />, <br />(IRRCD=2 on the 9-1 Card) but can be used with either the <br />percentage allocation (IRRCD=l) or control zone operations <br />(IRRCD=3). It can also be used for reservoirs that are <br />operated independently during normal operations to meet <br />demands. <br /> <br />The element number of the downstream reservoir which is to <br />be balanced with the reservoir for which this option is <br />selected is given by IDRBAL on the 9-1 Card. The program <br />checks to see if this is a reservoir element when a logical <br />analysis of inputs is requested (section 5.9). If logical <br />analysis is not used, an error message is generated and execu- <br />tion is terminated when an attempt is made to use the reservoir <br />balancing option. <br /> <br />IDRBAL must be located downstream so that releases can be made <br />and routed to it. If the downstream boundary is reached first, <br />a fatal error results with an appropriate error message being <br />written. <br /> <br />. <br /> <br />Operations are based on the balanced operation philosophy. The <br />percentage of the normal operating zone's capacity that is full <br />is computed for the upstream and downstream reservoirs. If the <br />upstream reservoir has a higher percentage, releases are made <br />(subject to outlet capacity restraints) from the upper reservoir, <br />routed to the lower reservoir, and stored there, thus bringing the <br />reservoirs into balance. When the percentage of the upper <br />reservoir is equal to or less than the lower, no operations occur. <br /> <br />2-14 <br /> <br />(rev. 03/75) <br /> <br />