switch between compressible storage and storativity

Hey guys

Just wondering if I could get some clarification. If I have a 3 slice model and I’m pumping from slice 2 what is the trigger to switch that slice 2 water level to change from using compressible storage to storativity? Is it WL < elevation of slice 2 or something else?

Thanks
Shaun

It is WL < elevation of slice 2 when layer 1 is set to 'phreatic', the others to 'unspecificed'. In case of a 'free & movable' top, it is WL = elevation of slice 1 < original elevation of slice 2.