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SewerGEMS Long Run

I am running a Storm model without Long Term Continuous Simulation, the model has 20 scenarios (exclude rational and 50 years storm), each scenario run takes around 15 min. when I did batch run the model took around 4 hours! and the model size reaches to around 11 GB. that is unusual, I am running the model on my laptop which is i9 processor with a 64 gm ram and a very good graphics card.

I am looking for a solution; that kills my time if I would do change and re-run the model. I am running epa swmm which required by the client. the model has gullies and gutters.

Is that a reasonable time for a run? how can solve that? is that due to the program capabilities?

Modelling gullies are required by the client for this development and his thought that would customize the pipe sizes and would give the design the real prediction of what will happen during the storm.

I uploaded the model for your kind review in the secured link.

Regards,

Mohamad

  • Hello Mohamad,

    The database size seems large. Are you using the Change Tracking feature? If so, this may be swelling the size of the database. This link has information on cleaning up the database file, which may help with the model run time.

    If that is not the issue, what solver are you using and how many elements are in the model?

    Regards,

    Scott

  • Dear Scott,

    I do not use Change Tracking.

    The solver is EPA SWMM

    Conduit 2324

    Gutter 1681

    Catch Basin 1784

    Manhole 542

    the model is uploaded. Please advise.

    Thank you .... Mohamad

  • Mohamad, 

    In thinking about this when you make a change it normally wouldn't effect all scenarios if you have the model setup correctly, so I don't understand why you would want to batch run all or even most of the scenarios at one time. It doesn't make logical sense to do that unless you need to because the run time will always be longer when you're batch running scenarios. What I would be doing if I made changes to a model was batching running on the scenarios that the change took place in, so  let's say for argument sake that is maybe 5 scenarios or so, if you have your model set up well. If you're running more than that it would seem to me that you might want to look into a more efficient scenario and alternative setup to help speed your analyses along, but that's just my two cents without having seen the model. 

    Regards, 

    Mark 

  • It would be interesting to know how long it took to run 1/4 of the scenarios in batch in comparison with how long it took to run each of those scenarios individually. In thinking more about this it sounds like there may be one or two scenarios, maybe more, in the model you have that might not be running efficiently, but again that is just a guess without being able to see anything.  

  • Dear Mark,

    I run those scenarios which have different rainfall (each one has rainfall), it is to evaluate the peak of FEH and check the higher runoff. it is logical to have them run all. the batch run made for such tasks. please check the model (have fun :) ).

    it is running but took 4 hours and the folder size after run all became 11 GB. it is the first time happen like that and not logic for each change I will make and run to wait 4 hours. it is really important to investigate and feed us back.

    you are so appreciated.

    Thank you,

    Mohamad.