It can also involve computation time step, reporting time step, etc.Īre you ponding or losing flow from an upstream node in the existing model? is this occurring in the proposed model? If not or the volume lost or stored is less, this could account for your increased flow in the proposed condition. To answer your question, would require a more detailed look at your model. The flows upstream may not change much if there is another controlling restriction in the system between the two locations. If the existing channel was a restrictive cross section, the new section may not be as restrictive and you could see an increase in the flow in that link. It is used for single event or long-term (continuous) simulation of runoff quantity. That is a more difficult question to answer in that it is how the channel change impacts the solution. SWMM is a dynamic hydrology-hydraulic water quality simulation model. That is not the same as the maximum flow computed in the simulation unless your flow depth reaches the maximum depth in the channel.Īs I reread your question, you are asking about why the maximum computed flow is changing. This can cause the maximum flow computed in the solution to change if this was restricting the flow through the existing channel section. The description I gave is based on the maximum channel depth and the maximum flow that can be computed in an open channel length. Not sure if this is still available in SWMM5. That is the description I was referring to in my response. I work mostly in XP-SWMM and there is a variable calculated called maximum design flow.
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