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Structures vs Withdrawal

If I have all the outflows data (gate, spill, tunnels etc), do I have to define them in both number of structures and withdrawal and give the flows in qwd.npt file. Or, only difine as withdrawals? Thanks Nimal
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I also have the same question. I have two withdrawal data and one dam releases. I have currently stated the dam releases as the other withdrawal making three withdrawals altogether and have not defined any structure. Is that ok to do? I have 3 branches with total 203 segments branch 1 has 2-190 active segments with the dam releases from the 190 segment. I am having some w2 error while i try to re-run the model after water balance and running the model with precipitation and evaporation on as uunstable water surface elevation. I am worried if it is problem causing that error? I tried reducing the timestep to fix the error as suggested in another thread but no luck so far. What did you do Nimal? Does anyone has suggestion on that?
Thanks, Ujwal