I’m modeling an ephemeral stream by RMA2. It consists in 2 trunks that merges into one. I’m trying a steady flow simulation with 2 flow-rate upstream condition. I don’t know downstream condition, but surely the water surface elevation of downstream boundary condition is lower than maximum node elevation of mesh. I run RMA2. In model control I’ve unchecked “specify initial water surface for coldstart”. The Model Checker reports that the water surface elevation of boundary condition is too low. If I Run model it gives NEGATIVE DEPTH WARNING and STOP depth convergence exceeds 50.0. Can anyone suggest me?