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It would be useful to add additional layers to bioretention structures. Currently the filtration layers only allow two layers. It would be useful to add far more.
This would mean you could model a bioretention area above a soakaway, or attenuation tank.
Currently I'm modelling a system where a raingarden is located above a crate soakaway but im having to use a no-delay connection, with a depth/flow relationship derived from the infiltration rate. But its a very manual task and difficult to evidence for checking/approvals.
