I am modelling a natural channel with a gated spillway. I am using the rectangular orifice option to install the gate .
In SWMM, orifice is added as a link between two nodes and according to the manual "located either at the bottom or along the side of the upstream node."
My question is does SWMM use the geometry ( depth + width) of the orifice to consider it as an usual conduit for the flow from upstream node to downstram node as it is connected between two junctions just like the conduis?
or Its just a gate acting at the upstream node though added as a link?
Thanking you in anticipation.