Product(s): PondPack Version(s): 08.11.xx.xx, 10.xx.xx.xx Area: Modeling Problem How does the Interconnected Pond Modeling (ICPM) algorithm work in PondPack? Solution Basically, it is a convergent algorithm that would take a long time to do by hand. However, once the program has found the solution at each time step, it is relatively simple to hand check any desired time step. Check the hydraulics (flow & elevation) at any time step by: At the desired time step, look at the elev. vs. time output table for the upstream and downstream connected pond (or tidal outfall). Read the elevation of the upstream pond at the CURRENT time step, and the elevation of the downstream pond at the PREVIOUS time step. Note: Upstream and downstream is relative to the way the network was laid out... NOT to the direction of flow, since reverse flow is reported as negative. Look in the E-Q-T outlet table for the upstream pond. Locate the flow rate (interpolate) for the given HW elevation in the upstream pond and the TW elevation (downstream pond surface) from Step 1 above. From the hydrograph table output, read the hydrograph flow rate for the upstream pond's outflow rate for the selected time step. It should approximately be equal to the flow rate interpolated in step #2 above.
↧