iMOD User Manual version 5.2 (html)

12.10SSC Specific storage coefficients

The storage coefficient for modellayers which can change from confined to unconfined conditions is defined by two IDFs (or constant values) for each modellayer. The SSC storage coefficient corresponds with the SF2 variable specified in the MODFLOW BCF package and the SS and SY variable specified in the MODFLOW LPF package.

porosity is sum of void spaces as specific yield is drainable volume (always les then porosity as some pores are undrainable due to capillary suction forces)