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Combining Sewage And Storm Models

I have For  the same network 2 Models one is Storm run using SWMM solver (the flows in the models are catchment areas with time depth graph) and the other is sewage run using GVF-Convex (the flows in the models are sewage flow entered as population and sanitary loading with extreme flow setups for the peak factor calculations), the question is how i combine them keeping the SWMM solver running (sewage flow are peaked and fixed in the manholes) ?!!

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  • Dears Craig & Jesse

    Thanks For Your Fast reply, i appreciated. The Network I am talking about is exiting one (all the data i have for it is only a sewage model with population and unit sanitary loads with solver GVF-Convex ) that carries sewage flow and in the construction phase the contractor connected the storm catch basins to it. so i need to simulate the most worst case that all pipes are fully loaded with the peak sewage flow while the exact storm event is happening. 

    I know that both engines will not run together, for that i tried to convert the peaked flow to a fixed one but i faced a problem that i can't get the peaked flow for each manhole to define it as inflow (wet) fixed flow.

    Thanks a lot in advance

    Diaa Abdelrahman 

  • Hello Diaa,

    Creating separate scenarios is a good approach to test your network.

    The first scenario can be "only the sewer network" with unit sanitary loads and population to determine sanitary flow through the network. You can use the GVF-Convex Solver for this.

    The second scenario (child of the first) can be "sanitary network + the storm flow". In this you can use the additional data of storm inlets using Active Topology Management to add the additional elements (catchments, catch-basins, conduits etc.) and add your storm events and specify them for your catchments. For this you can use the Implicit Solver which can model combined (storm + sewer) systems.

    If you are doing this, the flows in your model would be more realistic as per the storm events specified.

    Alternatively, you can simply add the wet inflow to the manholes based on the peak inflow calculated. What problem are you facing specifying this? You can specify "Fixed" flow type in it. Can you share a snapshot or elaborate on the problem?

    Hope this helps.


    Regards,

    Yashodhan Joshi

    Bentley Technical Support

Reply
  • Hello Diaa,

    Creating separate scenarios is a good approach to test your network.

    The first scenario can be "only the sewer network" with unit sanitary loads and population to determine sanitary flow through the network. You can use the GVF-Convex Solver for this.

    The second scenario (child of the first) can be "sanitary network + the storm flow". In this you can use the additional data of storm inlets using Active Topology Management to add the additional elements (catchments, catch-basins, conduits etc.) and add your storm events and specify them for your catchments. For this you can use the Implicit Solver which can model combined (storm + sewer) systems.

    If you are doing this, the flows in your model would be more realistic as per the storm events specified.

    Alternatively, you can simply add the wet inflow to the manholes based on the peak inflow calculated. What problem are you facing specifying this? You can specify "Fixed" flow type in it. Can you share a snapshot or elaborate on the problem?

    Hope this helps.


    Regards,

    Yashodhan Joshi

    Bentley Technical Support

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