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If the fraction for reservoir 1 is below the overall <br />fraction, there is nothing we can do. <br />In either case, we are done. Move on to reservoir 3. <br />(3) For reservoir 3, there is nothing to do. <br />(4) For reservoir 4, get the overall fraction (as with <br />reservoir (2) for reservoirs 1, 2, 3 and 4 (but excluding any <br />for which the share flag is set). <br />Now, from top to bottom, check that all reservoirs upstream of <br />reservoir 4 are above the overall fraction. If any one is not, <br />recalculate the overall fraction without the short reservoir. <br />-Repeat the process until all reservoirs are eliminated, or until <br />all of the remaining upstream reservoirs have something to <br />contribute to pool maintenance: <br />Then release enough water from each to bring it to the overall <br />fraction. Trap the released water at reservoir 4. <br />(5) Pool maintenance is now complete. If there were any <br />releases and there are unsatisfied demands, check the demands <br />again to see if the releases will help out. If the demands <br />report that they were helped, then the water didn't all go <br />for pool maintenance, and we need to do the pool maintenance <br />over again. <br />A diversion from a reservoir is considered to come from the <br />reservoir itself. Diverted water does not pass through the outlet <br />_ works of the reservoir, and is not available for power generation. <br />22