The Total Q upstream and downstream of the lateral structure is same in the upstream side of the culvert, which is also incorrect. Problem is that in both cases I am getting a negative flow through the culvert ('Q leaving Total') for the lateral structure. I have used steady state subcritical flow in the first run, and since the WS reached critical, tried the mixed flow. The culvert has a positive slope of about 4%. The flow in the channels are not inter-related and the channel that is at the downstream end of the culvert has negligible flow (0.3 m3/s) compared to the channel upstream (3.9 m3/s). That said, I am trying to model a lateral culvert between two minor drainage channels linked by a culvert.
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