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When the Surface layer is filled above its nominal capacity (due to the inflow exceeding the outflow for a sustained period, or the layer below preventing any infiltration), it is considered to be in a flooding state.

Flooded water is stored on in an area equal to the top area of the Surface layer. Except where the soffit of the SWC is below the exceedence level, as is possible in Tank, Cellular Storage and Chamber, where the maximum plan area will be used.

The flooding volume can be visualised in the SWC results. Similarly, to a Manhole, flooding water can return into the Surface layer at a later stage if there is capacity again.