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Reverse Flow in SWMM 5 during one time step

Subject: Reverse Flow in SWMM 5 during one time step

Reverse flow in a link of SWMM 5 occurs if the downstream head is greater than the upstream head. The flow calculations for the link are based on the time step head, cross sectional area(s),

Spatial Step in a SWMM 5 Link

SWMM 3,4,5 uses a spatial step equal to the length of the link. Or, in terms of the 1D St. Venant Equation for the calculation of flow used in SWMM 5:

In which

is the length of the conduit.

The program will calculate the cross sectional are

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Reverse Flow in SWMM 5 during one time step

Spatial Step in a SWMM 5 Link

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