Ground water depth formula (Subsidence Overlay)

At the start of a simulation, the ground water depth is initialized with the ground water depth geotiff (if provided) and is optionally overwritten by (managed) water level areas' water level. Furthermore, the ground water level can be managed with drainages (provided as underground buildings), either actively or passively.

has to be calculated for each cell individually and possibly updated for the previous occurred subsidence and water level indexation.