I am trying to model a connection between two lakes. I have an idealised short reach routing a flow hydrograph into the top lake, which is modelled as a storage area. Then I have the top and bottom lakes connected by a weir and culvert.
My problem seems to be the connection between the short reach and the top lake. No flow is passing the last cross-section and is instead backing up.
This post discusses connection of a reservoir to a reach, but the way to connect the reach to a storage area is the same. You have to “move” the last vertex of the reach line into the storage area for RAS to recognize the connection.