cantleave,
To be absolutely accurate there is liquid water in porous rocks as well as water that is bound up in certain minerals. There is an awful lot of water in the rocks below us and it can rise to the surface under certain geological conditions but if there was enough of that to cause world wide flooding then you would have bigger problems than just how quickly can you put on a pair of wellington boots. Anyone hoping for geological proof of the biblical flood is going to be very disappointed though.