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I have reviewed your model.
Initial time step was too large (i.e., 0.3 hours). Reduced it to 0.02 hours.
Routing period was too short. Model only runs then for 0.3 hours. Removed this entry.
DAMBRK is a wet model. The way you have the model defined, there is no base flow in the model. Since your inflow hydrograph is 726 cms, I assigned a turbine flow equal to that.
You did not have any dam overtopping discharge coefficient defined. For a sloping dam crest, this should be the weir coefficient.
Your sloping dam crest data was wrong. It goes from the bottom of the dam to the top of the dam. If you have a flat dam top, then define this as the weir coefficient times the length of the dam at the top. I deleted the sloping dam crest data and defined a default dam overtopping discharge coefficient. You should review what I have assigned.
Note that the downstream end of your model has an adverse invert slope. You cannot have that in a DAMBRK model, since it cannot compute a proper boundary condition for the model. The invert elevation at downstream cross section 8.12 is 40.00 meters and the invert elevation at the next upstream cross section 7.555 is 39.60. Hence you have an adverse slope. You either need to add additional downstream cross sections (artifical ones if you need to) in order to move the boundary condition away from this adverse invert slope, or you need to change the data that you have defined. For example, if I delete the downstream most cross section 8.12 in the model that I have corrected, the model runs to completion without any issues. However, the model that I have posted needs to be forced to run to completion.
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Linear Mode
