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Currently on many of my projects where we are designing the surface water drainage for substations. The surface water network is typically built up of filter drains within the substations platform. Currently we model the filter drain as an infiltration trench with an under drain. Ideally in Civil 3D the main thing we require from the Infodrainage model is the underdrain but when imported into Civil 3D all we get is a surface and nothing represented for the underdrain. Also the accurate modelling of the filter drains is challenging in infodrainage, as to get an accurate representation of the filter drain we model a short 1m pipe from each chamber which connects to the filter drain then similarly from the end of the filter drain to the chamber. I think it would be easier if filter drains were modelled as normal pipes instead of a stormwater control feature.
I have attached an example of what the filter drains look like in infodrainage with the two connections either side. When imported into Civil 3D all we get is the short pipe connections from the filter drains and it becomes a big remodelling task in Civil 3D to accurately represent the filter drain pipes.
