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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 entering inside the catchbasin vault below the surface, you would use "Flow (Additional Subsurface)."
If the flow is overland flow that approaches the inlet opening (and can be captured or bypass), you would use "Flow (Additional Carryover)".
These are useful in cases where you do not want to include catchment hydrology or do not want to include upstream gutter hydraulics.
Understanding known flows
Entering catchment data directly to a catch basin