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<br />(b) Pumping may be done at a variable rate. dependent <br />upon the water surface elevation of the ponding area; the pump will, <br />as above, turn on and off at a specified water surface elevation. <br /> <br />(3) ponding area discharge due to overflows or diversions <br />as a function of elevation. <br /> <br />b. The program has the feature of being able to recycle automati- <br />cally by adding only those cards needed to reset desired variable values. <br /> <br />3. DESCRIPTION OF EQUIPMENT <br /> <br />This program is usable on any computer utilizing a Fortran IV <br />compiler, providing a printer capable of printing 132 characters per <br />line is available. The printer, as well as the card reader, may either <br />be on.or off-line. <br /> <br />4. METHOD OF COMPUTATION <br /> <br />a. This program is based on the modified Pu1s routing procedure, <br />where the outflow is a function of storage expressed in the form of a <br />2S <br />storage indication value (~t + 0) as used in the following equation: <br /> <br />2S2 2S1 <br />(~t + O2) = (-;~t+ 01) + 11 + 12 - 201 <br /> <br />b, The computational procedure is more difficult in this application <br />than in a normal flood routing (reservoir routing) application due to the <br />effect that the tailwater elevation (river stage) has on the storage vs. <br />discharge relationship of ponding area outfall. e.g., when the river is <br />low the outflow from the ponding area is gravity flow, and when the river <br />rises above the elevation of the outlet to the river the discharge is <br />pressure flow, The program handles both cases, using an array approach; <br />initially both the river elevation and the storage indication value for <br />a given routing period are calculated. The computer then utilizes the <br />data to compute an array of storage indication values for that river <br />elevation (taking into account gravity or pressure flow, pumping. etc.) <br />until a larger storage indication value than that value corresponding to <br />the routing period is found. Then, using an interpolation process, the <br />final ponding area data is determined before the next routing period <br />begins. <br /> <br />c. This program will handle inflow due to seepage. based on the <br />following assumption: the differential head which causes inflow by <br />seepage for a given routing period is that head which existed at the end <br />of the previous routing period; this assumption is logical if itis kept <br />in mind that there is a time delay seepage. The assumption also enables <br />a direct solution to be reached, rather than a tria1-and-error solution. <br /> <br />2 <br />