Hello,
I'm simulating a drainage network in SewerGEMS. The network consist with open channels, closed conduits, pond, pump, POS(no control structure).
when I simulate the model in Explicit and implicit solvers, I'm getting two different profiles as shown in the figure. error seems to be in Explicit Solver (jump in EGL).
(I have set Routing time step and SWMM output increment to 1 min in Explicit solver with Slot surcharge method). Further, the runoff method is SCS CN method.
Any advice that I can fix this issue in the explicit solver? (As I have to simulate it in Explicit Solver)
Thanks
Nishadi
Hello Nishadi,
I would try setting the Routing Time Step to 1 second to see if that improves the results. If not, I would check the continuity error in the calculation summary. If the value is high, this could account for the instability in the results. The following link has steps to improve the stability when using the Explicit solver: Troubleshooting unstable SewerGEMS and CivilStorm model results using the Explicit SWMM Solver.
If the results are more stable in the Implicit solver, can you just use this instead?
If this doesn't help, we may need to see a copy of the model files.
Regards,
Scott