(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.
Where an overflow from a rainwater tank is connected to a storm drainage system, it shall be connected by
an air break, or
a backwater valve installed on the storm drainage pipe before the connection to the storm building drain.