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<br />Advanced Concepts <br /> <br />Pool Maintenance . .' <br /> <br />, <br />, <br />. , <br /> <br />5.5 Pool Maintenance <br />Pool maintenance is performed after all demand water has been allocated. The maintenance <br />starts at the top of the basin and works toward the bottom. At each reservoir, the routine attempts to <br />balance the reservoirs by releasing enough water from upstream reservoirs to bring all reservoirs <br />under consideration to the same index level. <br />(1) For reservoir I, there is nothing to do. <br />(2) For reservoir 2, sum the target contents of reservoirs 1 <br />and 2 (ST), the actual contents (SA), the max contents <br />(SX), and the minimum contents (SN). Note that we will <br />perform pool maintenance only with reservoirs where the <br />share flag (from the RES card) is 0; if the share flag was <br />set (to 1) we will not include the reservoir in the <br />maintenance routine for any other reservoir. <br />If the actual contents are over target (SA > ST) we <br />are interested in the fraction (SA-ST)+(SX-ST). <br />If the actual contents are under target (SA < ST) <br />we are interested in the fraction (SA-SM)+(ST-SM). <br />The fraction so obtained is either the fraction from <br />target to max, or the fraction from min to target. We <br />would like all reservoirs in the maintenance to have the same fraction, and we'll achieve this <br />by releasing water from upstream reservoirs. <br />If the fraction for reservoir I is above the overall fraction,. release water to bring it <br />down to the overall fraction and trap the release at reservoir 2. <br />If the fraction for reservoir I is below the overall fraction, there is nothing we can <br /> <br />(3) <br />(4) <br /> <br />(5) <br /> <br />do. <br /> <br />b <br />L8 <br />A' <br /> <br />In either case, we are done. Move on to reservoir 3. <br />For reservoir 3, there is nothing to do. <br />For reservoir 4, get the overall fraction (as with reservoir 2) for reservoirs I, 2, 3 and 4 (but <br />excluding any for which the share flag is set). <br />Now, from top to bottom, check that all reservoirs upstream of reservoir 4 are above <br />the overail fraction. If anyone is not, then recalculate the overall fraction without the short <br />reservoir. Repeat the process until all reservoirs are eliminated, or until all of the remaining <br />upstream reservoirs have something to contribute to pool maintenance. <br />Then release enough water from each to bring it to the overall fraction. Trap the <br />released water at reservoir 4. ' <br />Pool maintenance is now complete. If there were any releases and there are unsatisfied <br />demands, check the demands again to see if the releases will help out. If the demands report <br />that they were helped, then the water didn't all go for pool maintenance, and we need to do <br />the pool maintenance over again. <br /> <br />'I <br /> <br />March 25, 1991 <br /> <br />HYDROSS 4.1 <br /> <br />Page 33 <br />