[Typ]

Hello,

iam modelling waves with interfoam.
the waves break on a beach, after breaking some of the water flows back downwards the beach.
i wonder if there is a way to calculate how much of the water flows in to a domain and how much of the wave flows out of the domain.

i want to calculate how much of the water flows back (downwards the beach)

Or in general: how can i calculate the volume flow in and out of a surface?