The maximum amount of liquid water that can be held in the pore spaces of a snowpack by capillary forces is referred to as the liquid water holder capacity, LWCAP and is computed using:

where SWI is the irreducible water saturation and is expressed as a fraction of the total pore volume.

Any liquid water in excess of the holding capacity will be released from the pack, therefore:

and then set equal to LWCAP.

The values of RUNOFF_SNOW for each time step provide input to IA routine.