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I have encountered a situation where my WSE elevation is triggering the pressure flow boundary at a bridge, solving for that scenario, then lowering the WSE below pressure flow.... and back and forth, causing instability. What is the best approach for removing this numerical instability from my bridge? The mesh configuration and boundary conditions are correct as they have worked correctly in other flow scenarios. It just happens that the WSE is juuuust at the edge of submerging the bridge opening. Thoughts?