A sewer that is vested in and maintained by a sewerage undertaker. ainwater harvesting or rainwater use system A system that collects rainwater from where it falls rather than allowing it to drain away. It includes water that is collected within the boundaries of a property, from roofs and surrounding surfaces.

A sewer in which all owners of abutting properties have equal rights and which is controlled by public authority.

Also called municipal sewer, it is the main sewer system to which private sewers are connected.

A common sewer directly controlled by public authority.