Hong Kong Regulations

BUILDING (STANDARDS OF SANITARY FITMENTS, PLUMBING, DRAINAGE WORKS AND LATRINES) REGULATIONS - REGULATION 33

Rain water pipes for verandahs or balconies

(1) Any rain water pipe provided for the carriage of surface water from a
verandah or balcony shall, where there is, at a suitable position, a
rain water pipe provided for the carriage of surface water from the roof of
the building, be connected to such pipe.

(2) Where a rain water pipe provided for the carriage of surface  water from a
verandah or balcony discharges to the side channel in a street or is, in
accordance with paragraph (1), connected to a rain water  pipe which so
discharges, the internal diameter of the rain water pipe from the verandah or
balcony shall be not more than 40 mm. (L.N. 294 of 1976)