I would to ask about the screenshot below; why the Hydraulic Grade Line does not go down below the ground level in spite of the flow "overflow" goes down during the simulation (9 hours), the expectation is the HGL level to dropdown.
Regards,
Mohamad…
SewerGEMS: Why I have zero overflow volume (Hydraulic Reviewer manhole table) in manholes that show "True" in the "Is ever overflowing" field? I'm using the explicit SWMM solver and I don't have bolted covers. Thank you very much.
Hello,
I'm having an issue with a model that I am building in CivilStorm. I'm trying to export hydrograph data for the amount of flow exiting an inlet due to flooding. Some of the inlets in the model work fine and I can load the graph and export the…
Hi,
I'm trying to calibrate an existing Waste water collection network which is a combination of several conduits, manholes, pumping stations with wet wells, pumps and pressure pipes. etc., and had following concerns.
1. While running the analysis…
Hello,
I am using SewerGEMS (version 10.03.01.08) to model a subsurface system that has inflow coming from an open channel. The open channel flow enters the subsurface system via a standard culvert with headwall, but there is an overflow channel above…
I am working on a complex dynamic wastewater model, and there is one area where there are two separate lift stations that are connected by a gravity line. When one lift station on the downstream end of the gravity line gets backed up due to high flows…
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Update:
Here is the result when I turned off the overflow. It looks like the manhole HGL dropped almost 1.5 ft from the previous graph. Am I missing something? It seems odd that the HGL dropped despite removing the overflow conduit. (Note that the manhole…
I wanted to update that I am somewhat confused about adding "overflow" conduits (trap. channels). Based on some results I was just looking over, it looks like the overflow link is continuing to increase in flow, even though the manhole only is surcharging…
I am trying to reduce the "overflow volume" in the model calculation summary.
I have achieved this partially by -
- Adding overflow links (link to outfall structure with boundary condition set to discharge at next downstream node)
- Adding surface…
Just a couple things to mention here:
We have an article that talks a bit about the different solvers:
http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/11852.sewercad-gvf-convex-solver-vs-sewergems-implicit…
Hi rdueck,
Regarding questions #1 and #2, I'm checking into a few things first so I can give you a complete and accurate answer.
For #3, if the subsurface piping overflows out of the catchbasin, that overflow is accounted for in the downstream gutter…
Paul,
As you point out, StormCAD isn't designed for this kind of calculation.
I don't quite follow the workaround you described, but I think it is similar to what I would do if I were forced to use StormCAD for this type of calculation. Basically…