Pre 2014 Blogs

Simulating a "shut off" or "closed" conduit in SWMM

Posted by Asaph Mercy Kabaasha on November 24, 2011 at 3:47pm

Hello Members,

Though not a common practice in drainage systems, I was trying to simulate a "closed" or "shut off" pressurized conduit in SWMM5 to see the effect it would have to the performance of the whole system.

I am using an ORIFICE whereby a discharge coefficient of "0" represents a closed ORIFICE hence a closed (no fluid passing through) conduit and discharge coefficient of "1" to represent an open ORIFICE hence an open (fluid passing through) conduit.

This seems to work for a small non-looped network but when I try to apply it to a bigger network the results look not to reflect reality.

Could anyone out there be having an idea how I can do this since SWMM has no Valve objects to close and open a conduit?

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