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Currently ICM treats storage areas where there is a change in area at a certain level as symmetrical. This limits hydraulic modelling by constraining the structures that can be built. An option to account for asymmetry would be useful ( similar to when defining a new conduit shape)
Thanks for raising this. I can see why having the ability to represent asymmetrical tanks directly would feel more flexible, especially where the structure doesn’t behave uniformly with depth.
At the moment though, this sits quite low in our priority list, so we won’t be progressing it in the near term. A workable approach in the meantime is to define a depth–storage relationship that reflects the asymmetry you need. This allows the tank to behave hydraulically as intended even though the geometry is represented using the existing symmetrical form.
We’ll keep your suggestion on record for future consideration.