[Chris Maeder]

Teddy:

You can model this situation with a "multi-link". Simply define a junction at both ends of the siphon. Then, define one link to represent the siphon. Then, define another link to represent the spill-over. You can represent the spill-over as a weir link if you want, or as an open channel link.

Alternatively, you could represent the upstream side of the siphon as a flow diversion, and then simply define the cut-off flow where you want flow to discharge as excess spill-over. This is extremely easy to setup.

Also, StormNET allows you to add controls to pipes and other links to allow them to open and close (as well as do other operations) in real time. Contact me directly and I can send you some example models that demonstrate these capabilities in StormNET. Basically, StormNET can model real-time controls.

If you have any other questions, please let me know.

Sincerely,

Chris Maeder, M.S., P.E.
Senior Technical Engineer