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Thank you for the suggestion and thanks to those who voted.
Users can still model a flat bio-retention and connect it manually to an infiltration trench with a different slope to satisfy the requirements of the local authority. Please try the above and let us know how you get on.
I did find that it is possible to force the underdain slope if you add a longitudinal slope to the bioretention, however in this specific design we do not have a longitudinal slope, but would need one for the underdrain to be