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  1. SabrinaPAE

    EPANET System Unbalanced

    Coloeng, Which western pipe did you close and see negative pressures at J7? I am trying to replicate that result, and am not able to do so...
  2. SabrinaPAE

    EPANET System Unbalanced

    Coloeng, I ended up using a reservoir with a pump curve, with the reservoir set at the surface elevation at that location (see the updated model, attached). The system is calibrated on the right side of the model given two other hydrant flow tests, but it is the hydrant flow test previously...
  3. SabrinaPAE

    EPANET System Unbalanced

    Coloeng, Thank you for your response. There is not actually an elevated storage tank at that location. I am not sure what the hydraulic gradeline was when the hydrant flow test was performed. I have another hydrant flow test that was conducted on the 16-inch main located near where I have...
  4. SabrinaPAE

    EPANET System Unbalanced

    I don't quite understand what you're saying.
  5. SabrinaPAE

    EPANET System Unbalanced

    Please see the attached and updated model - I created a curve (CU6) and applied that curve to both GPV's. The curve does not have any inverted curves, as you previously mentioned, and I've modeled the pressure drop across the double check valve & backflow preventer accurately (there should be a...
  6. SabrinaPAE

    EPANET System Unbalanced

    So what is the solution to this? Should I not use the GPV curves I generated? I obtained them from manufacturer specs, but am open to doing the "right" model. Update: I ended up simplifying the curves I created to make them linear, system is never unbalanced now. Last question (see attached...
  7. SabrinaPAE

    EPANET System Unbalanced

    I have demand with all three hydrants off, yes. I am using demand at hydrants to calibrate the model, from hydrant flow tests. I already have demand on various nodes in the system corresponding to REU tables based on building type - are you suggesting to put a small demand at one of the...
  8. SabrinaPAE

    EPANET System Unbalanced

    Hi all, I'm new to this forum, but am struggling with an error message I am receiving in EPANET. I am modeling the existing water system for a University in West Michigan. I am using a tank as the supply to the system, and adding nodes to respective locations to add demand to buildings in...

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