Hello George, Assuming that you you want to use the weir only in the scenario with the smaller storm event, you can use scenario management to do this. You would have two physical alternatives, one for the smaller storm event and one for the larger. Once the appropriate physical alternatives are assigned to the scenarios, you can then set the weir in the scenario with the smaller storm event. Similarly, the larger storm scenario will not use the start control structure. Regards, Scott
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