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Reach question

Reach question

Reach question

Ok, since I can't model a reach as a reach (due to tailwater issues) and must model it as a pond, I have a question.
When describing this channel as a "culvert" what do I use as my entrance loss coefficient since my entrance is nothing more than a channel opening?


RE: Reach question

As you're aware, a reach routing is recommended only for normal open-channel flow.  This assumes normal Manning's flow, and cannot handle tailwater effects.  See www.hydrocad.net/reach.htm for details.

If there is ponding at the reach inlet, then we recommend using a pond with a culvert outlet.  This will model the ponding effect at the inlet, using the culvert as an outlet control.

If you have a smooth channel-to-pipe transition, this will have a relatively low entrance loss coefficient, like a well-rounded inlet.  But if you have a protruding pipe end, the value will be higher.  The choice of coefficient is really the same as for a "real" pond.


Peter Smart
HydroCAD Software

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