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I have seen this error before when I have stream arcs defined as "General Stream" as the stream arc type and diffusive wave turned on for the stream routing in the job control. If you would like to use stream routing, it requires you to define the stream arcs as "Trapezoidal Channel" and define the geometry (base width, side slopes, etc.). The other option would be to leave them as "General Streams" and turn off 1D channel routing.



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