The extent of flooding in the 3D view should be proportional to the volume of flooding of that manhole. At the moment it shows the same extent of flooding whether it's 0.1m3 or 100m3. Would make visualisation the extent and location of flooding on the site much easier as it was in Microdrainage.
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Thank you for the suggestion and thanks to those who voted.
In InfoDrainage, users can visualise the flood volume on the top of the manholes and can visualise the difference between flooded volumes proportionally. The difference will only manifest in depth, whilst in other software, you might see that difference manifesting in area.
For proper visualisation of flood volume spread over a surface, I recommend using a surface file and then running a 1D/2D analysis to get an accurate representation of where and how the flood volumes would propagate over the surface.