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TC line and swale in the subcatchment area

TC line and swale in the subcatchment area

TC line and swale in the subcatchment area

(OP)
Hello,

I am trying to model a runoff drain to a swale. The swale is inside the drainage area.

In the HydroCAD model, I have one subcatchment going to a reach(open channel), but the TC in the subcatchment area includes the swale that is going to be discharged to. I was wondering if I should divide the subcatchment area into two subcatchment areas, so the TC would end before entering the swale. Does it make any difference doing so? Please advice.

Best,
Serene

RE: TC line and swale in the subcatchment area

In general, the Tc calculation should end at the next node in the routing diagram. So if you use a separate reach to model the swale, you should not include the reach as a Tc segment. If you don't need to perform a separate reach routing, then you can include the swale as a Tc segment. Do one or the other, but don't include the swale in both places.

For further details please see www.hydrocad.net/tc.htm

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: TC line and swale in the subcatchment area

(OP)
Hello Peter,

Thank you so much for the explanation. It is clear to me now.

Best,
Serene

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