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Flow routing

Posted by Vasenjka on June 19, 2012 at 12:35pm

Hello!

I am getting Flow Routing more then 70% difference, and I can't figure why. Could someone please  take a look at my model and see is someone can figure it why? In some node there is a difference of almost 1000%, which is crazy.

Also, what would be the best way to model system where most of rainfall never enters sewer system, it mostly evaporates or infiltrates in local area? I did put Horton parameters quite high, but I still get surcharging where it actually never happens.

Thanks!

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Replies

  • Vasenjka June 19, 2012 at 1:32pm

    Yes, this model gives me a headache :(  I'll try that, thanks. I am aware what should I do, but I guess I just can't describe all parameters real because, ironically; I won't get real results.

    Thanks once again :)

  • Robert Dickinson June 19, 2012 at 1:24pm

    You have the same imperviousness and slope for every subcatchment, if you reduce the imperiousness and lower the slope you will have less runoff.

  • Vasenjka June 19, 2012 at 1:08pm

    So I should try to decrease Subcatchment area? There's no other way, because I don't have any field calculated values to compare, only visual that there is no flooding.

    Thanks for that Time step tip, it really made a difference.

  • Robert Dickinson June 19, 2012 at 12:51pm

    You are not getting a lot of runoff, 

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    Robert Dickinson said:

    Hi, Change your time step to 10 seconds and you will have a great continuity error.

  • Robert Dickinson June 19, 2012 at 12:49pm

    Hi, Change your time step to 10 seconds and you will have a great continuity error.

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