(a) "Pool" means an excavation, depression, construction, receptacle or container designed or constructed to hold or retain water.
(b) "Permanent residential swimming pool" means a pool that is permanently installed, used or intended to be used solely by the owner or lessee thereof, his family and by friends invited to use it, without payment of any fee.
(c) "Portable pool' means a pool having a three-foot high or over retaining wall.