Hong Kong Regulations

BUILDING (PRIVATE STREETS AND ACCESS ROADS) REGULATIONS - REGULATION 24

Drainage of private streets, etc.

(1) Every private street, cul-de-sac, access road, pedestrian way and service
lane shall be provided with channels and drains and sewers for the carriage of
rain-water and surface water.

(2) The size and gradient of every such channel, drain or sewer shall be
adequate to carry off all rain-water falling on and surface water draining to
the private street, cul-de-sac, access road, pedestrian way or service lane.

(3) For the purposes of this regulation, the intensity of rainfall shall be
calculated-

   (a)  where the Time of Concentration is less than 30 minutes, at the rate
        of not less than 150 mm/h; and

   (b)  where the Time of Concentration is 30 minutes or more than 30 minutes,
        at the rate of not less than 100 mm/h. (L.N. 294 of 1976)