Hello George, Using Scenario Management as Scott suggest is a good way to test physical conditions as per your requirements. In the first scenario you can use the initial weir elevation (under normal flooding conditions). In the second scenario you can create a new physical alternative to modify the weir elevation for when your runoff increases. For the first scenario you can annotate / color code the manholes with the "Is Overflowing?" property to understand which of your manholes are overflowing. This will give you an idea how much of your network is backed up in the initial condition (prior to adjusting weir elevation) You can check the same again when the weir is manually adjusted. Hope this helps.
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