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<br />Step 9 - With variable "ITYSP" = 10, the flood routing is accomplished <br />by making flood releases from the controlled spillway by adjusting the <br />gate openings for the desired release as generally described in the <br />Reservoir Regulation Engineering Manual (EM 1110-2-3600). The flood <br />routing is started with the first inflow that is f'tI"eater than "QSURO". <br />The starting conditio~ are printed out for the previous period's inflow. <br />A discharge of "QMIN1" is released Wltil "QMIN1" is exceeded by the com- <br />puted reservoir released based on the gate regulation schedule computed <br />from equation No.3, Page 15 of EM 1110-2-3600, using the induced sur- <br />charge envelope curve computed from the tables "IPERDQ" and "IPERSR". <br />The gate schedule release is then made as long as the computed gate regu- <br />lation release is greater than the previous release. When the computed <br />gate regulation release is less than the previous release, the maximum <br />gate opening made is retained until the pool elevation falls below the <br />top of flood pool (as described on Page 15, 16 of EM lllO-2-3600. The <br />discharge from this partial gate opening is computed by first computing <br />the vertical gate opening (xn) required to f'urnish the desired discharge <br />for the previous period (assuming all gates open equally): <br /> <br />, <br /> <br />FQAV = A V 2gH/k <br /> <br />where k is assumed = 1 <br /> <br />or xn = FQAV /(((64.4 * HEAD) * * .5) * SPWID) <br /> <br />A gate opening of 4 feet is assumed first and the corresponding head is <br />computed. This head is measured from the center of the gate opening to <br />the pool elevation. Using this head a new gate opening is computed and <br />then a new head and so on until 5 trials have been made. Each trial the <br />gate opening becomes closer to the correct answer and at the end of the <br />5 trials the answer is real close. The discharge for this period's gate <br />setting is based on the following equation: <br /> <br />Q.CAVE = (HH- . x A V2g~- <br />~ A i'""Z'g <br /> <br />or simply Q.CAVE = PQl.V * ((H/IIDAD) * * .5) <br /> <br />Although the computation process appears to change the gate setting for <br />each period on the partial gate opening routine, the actual gate open- <br />ing change is negligible. This computation process is simpler to program <br />than to calculate the maximum gate opening for the last release (based <br />on gate regulation) and vary this discharge based on pool elevation change <br />alone. <br /> <br />12 <br />