Deep bore soakaways should able to have different infiltration rates

Where there are different infiltration rates (as the deep bore passes through different soils) it would be helpful if Flow was able to replicate what has possible in other software for some time, where these can be applied based on the sub soil materials.

For example, the bottom 2m (chalk) with one rate, whilst from 2m up to 15m from the base a poorer infiltration rate, rather than being able to only model the bottom 2m or the lower rate but not both in the same model.