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Virginia specifications for a bioretention requires the underdrain to have a slope to it, but Infodrainage slope does not allow for this in the SWC bioretention SWC. Also, we sometimes have to place the underdrains in a trench below the storage layer and has a different square footage from the bioretention bed. It would be helpful if we can add in additional layers into the bioretention filtration layers tab with individual square footages for each layer.
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