GIM and infiltration zones
When rainfall is applied to the 2D mesh with infiltration zones, it would be advantageous to have a GIM module that works with the infiltration zones, their infiltration model (i.e. Horton) and the sewer system to represent rainfall induce infiltration more effectively.
A. Weisgerber commented
This is also relevant for infiltration to rivers (slow response) when modelling direct-2D rainfall.