Div. B › Part 7 › 7.4 › 7.4.2 — Connections to Drainage Systems

7.4.2.2 — Connection of Overflows from Rainwater Tanks

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(1) Where an overflow from a rainwater tank is connected to a storm drainage system, it shall be connected by,

(a) an air break, or

(b) a backwater valve installed on the storm drainage pipe before the connection to the storm building drain.

Defined terms on this page

air break

means the unobstructed vertical distance between the lowest point of an indirectly connected waste pipe and the flood level rim of the fixture into which it discharges.

backwater valve

means a check valve designed for use in a gravity drainage system.

building drain

means the lowest horizontal piping, including any vertical offset, that conducts sewage, clear water waste or storm water by gravity to a building sewer.

drainage system

means an assembly of pipes, fittings, fixtures and appurtenances on a property that is used to convey sewage and clear water waste to a main sewer or a private sewage disposal system, and includes a private sewer, but does not include subsoil drainage piping. Drinking water system has the same meaning as in subsection 2 (1) of the Safe Drinking Water Act, 2002.

rainwater

means storm sewage runoff that is collected from a roof or the ground, but not from accessible patios and driveways.

storm building drain

means a building drain that conducts storm water and is connected at its upstream end to a leader, sump or catch basin, and at its downstream end to a building sewer or a designated storm water disposal location.

storm drainage pipe

means all the connected piping that conveys storm sewage to a place of disposal and includes the storm building drain, storm building sewer, rain water leader, catch basin and area drain installed to collect water from the property and the piping that drains water from a swimming pool, other than a public pool, or from water cooled air-conditioning equipment, but does not include, (a)a subsoil drainage pipe, or (b)a private sewage treatment and disposal facility designed for the treatment or retention of storm sewage prior to discharge to the natural environment.

storm drainage system

means a drainage system that conveys storm sewage.

building

(a) a structure occupying an area greater than ten square metres consisting of a wall, roof and floor or any of them or a structural system serving the function thereof including all plumbing, works, fixtures and service systems appurtenant thereto,
(b) a structure occupying an area of ten square metres or less that contains plumbing, including the plumbing appurtenant thereto,
(c) plumbing not located in a structure,
(c.1) a sewage system, or
(d) structures designated in the building code; Act

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