Hi George, If you're using the Explicit (SWMM) solver in SewerGEMS or CivilStorm, you can change the weir height via SWMM controls: Using SWMM Control Sets in SewerGEMS and CivilStorm Otherwise, you might be able to simulate the impact of the weir and its change in position via the "Time-Elevation curve" boundary type at the outfall.
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