• Overflow in SewerGEMS

    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…
  • Zero overflow volume in manholes that show True in the "is ever overflowing"?

    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.
  • Flow(Overflow) graph doesn't match data shown in Flow(Maximum Overflow) graph

    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…
  • Continuity Error and Over flow summary mismatch

    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…
  • Culvert Headwall with Overflow Channel

    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…
  • Don't get flow between two lift stations connected by gravity line when one backs up (SewerGems)

    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…
  • New Product Release: OpenFlows FLOOD

    We are pleased to announce the availability of OpenFlows FLOOD, a flood modeling software for understanding, simulating and mitigating flood risks in urban, riverine, and coastal areas. OpenFlows FLOOD uses numerical models to simulate a range of hydraulic…
  • RE: Troubleshooting Overflow in an Existing Municipal Sewer Network

    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…
  • RE: Troubleshooting Overflow in an Existing Municipal Sewer Network

    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…
  • Troubleshooting Overflow in an Existing Municipal Sewer Network

    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…
  • RE: Choice of Solver for Wetwell Failure Analysis

    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…
  • RE: Modeling Gutters in SewerGEMS: Flow, Depth, and Spread

    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…
  • Re: StormCAD inlet surging

    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…