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What are the fields "Flow (Additional Subsurface)" and "Flow (Additional Carryover)" and when should they be used?
These flows represent pre-calculated flows can be added directly to a catch basin.
If it the flow to be included is subsurface flow, you would use "Flow (Additional Subsurface)." If the flow is overland flow, you would use "Flow (Additional Carryover)".
Understanding known flows