Reach question
Reach question
(OP)
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?
Thanks,
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?
Thanks,





RE: Reach question
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
www.hydrocad.net