### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

56. Construction of manholes
(1) Every manhole shall be of such size and form as to allow ready access for rodding and shall be constructed of—
(a) brickwork in cement mortar at least 215 mm in thickness;
(b) concrete at least 125 mm in thickness; or (L.N. 439 of 1990)
(c) other approved impervious material. (L.N. 294 of 1976)
(2) The foundation of every manhole shall be constructed of concrete not less than 150 mm in thickness. (L.N. 294 of 1976)
(3) Benchings shall be formed above the level of every drainage channel in a manhole to fall towards such channel at a gradient of 1 in 2.
(4) The benchings and all the internal faces of every manhole shall be rendered with cement mortar so as to provide a smooth and impervious surface.
(5) Every drainage channel in a manhole shall be not less than half round glazed earthenware or cement rendered, and shall have a diameter not less than that of the largest drainage inlet into and not more than that of the outlet from the manhole.
(6) Every drainage inlet to a manhole shall discharge into the drainage channel therein with properly made bends constructed within the benching of the manhole.
(7) Every manhole shall be fitted, on a level with the ground surface, with a cast iron airtight cover of adequate strength and approved design:
Provided that every manhole inside or under a building shall be fitted with a double-sealed cast iron airtight cover. (L.N. 361 of 1980)

### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

57. Disconnecting traps
(1) A suitable and efficient disconnecting trap shall be provided for every drain and sewer provided for the carriage of foul water, and for every drain and sewer provided for the carriage of surface water except where such drain or sewer is connected to a stream course or an open nullah.
(2) Except under and in accordance with a permit issued under the Land (Miscellaneous Provisions) Ordinance (Cap. 28) to occupy Government land thereby, every such trap and the manhole in which it is fixed shall be situated on land owned by the owner or owners of the building or buildings for which the drain or sewer is provided, at a position as near as practicable to the place at which such drain or sewer is connected to a public sewer or, in the case of a drain or sewer, provided for the carriage of surface water, which is connected to a covered nullah, at a position as near as practicable to the nullah. (L.N. 361 of 1980; 29 of 1998 s. 29)
(3) Every such trap shall be—
(a) fixed within a manhole;
(b) so formed and fixed as to have a water seal of not less than 75 mm; and (L.N. 294 of 1976)
(c) provided, as an integral part of the trap, with a cleaning eye.

58. Gullies
(1) Open trapped gullies shall be covered with a suitable grating having openings equal to an area not less than the cross sectional area of the outlet of the trap.
(2) Where sealed trapped gullies are used, adequate provision shall be made for the ventilation of the space above the water level of the trap.

59. Cleaning eyes
Every cleaning eye shall be—
(a) fitted with a cover, in order to make the cleaning eye airtight and watertight; and
(b) of such size as to allow easy entry for cleaning rods.

60. Filling in of drainage trenches
(1) All trenches in which drains or sewers have been laid shall be carefully filled in, around and above the drains or sewers, with earth which shall be carefully rammed and consolidated.
(2) No stones or other material which will not pass through a 50 mm ring shall be deposited in any such trench within 300 mm of the top of any drain or sewer. (L.N. 294 of 1976)

### Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations 《建築物(衞生設備標準、水管裝置、排水工程及廁所)規例》

61. Surface water channels
(1) Channels provided for the carriage of surface water shall be of adequate size, constructed of approved impervious material, finished off smooth and laid to a gradient of not less than 1 in 100.
(2) Suitable grilles shall be provided to prevent sand, silt and other debris from entering any public sewer, public channel, nullah or stream course.
(3) A cover in a foot-path to a channel for the carriage of surface water shall be flush with the path surface and any hole in such cover or between such cover and another shall not exceed 20 mm in one dimension. (L.N. 366 of 1984)

62. Disposal of effluent
(1) The owner of any building who is about to install a septic tank shall submit to the Building Authority for his approval the methods by which it is intended to dispose of the effluent and sludge from the septic tank.
(2) The Building Authority shall not give his approval thereof if, in his opinion, the method or methods proposed is or are likely to cause a nuisance or injury to health.
(L.N. 361 of 1980)

63. Situation of septic tank
(1) No septic tank shall be situated within 18 m of any spring, stream of water or well, the water from which is used or likely to be used for drinking or domestic purposes or for the manufacture or preparation of articles of food or drink for human consumption or for the cleansing of vessels used in the manufacture or preparation of such articles. (L.N. 294 of 1976)
(2) Every septic tank shall be so situated that the removal of sludge can be carried out by an approved method.
(L.N. 361 of 1980)

64. Design
Save insofar as provision is made therefor in these regulations, every septic tank together with any ancillary installation for the disposal of septic tank effluent shall be of such design as the Building Authority may approve.
(L.N. 361 of 1980)