[Chimera-users] Detection of Internal water along MD trajectory

Dear Chimera users! I've performed md simulation of water soluble protein having water-assessable channel in its interior. I'd like to perform analysis of average number of water molecules detected within the protein interior during MD trajectory with the possible visualization of such internal water binding sites. Does SASA calculation which I've seen in vmd could provide me with additional insights? I'd be thankful if you provide me with some Chimera tools suitable for such task. Many thanks for help, James