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　　(L.N. 361 of 1980)
　　
　　Cap 123I reg 52 Ventilation
　　
　　(1) Every drain provided for the carriage of foul water shall be ventilated at its highest point by means of a ventilating pipe having an internal diameter of not less than 50 mm. (L.N. 294 of 1976)
　　
　　(2) Every manhole in which a disconnecting trap is fixed shall be adequately ventilated.
　　
　　(3) Branch drains shall be ventilated at their highest point, if the Building Authority so requires.
　　
　　Cap 123I reg 53 No traps between ventilated points
　　
　　No trap or other obstruction to the free circulation of air shall be placed between the ventilation openings at the lower and higher ends of any drain or sewer.
　　
　　Cap 123I reg 54 Drains and sewers under buildings, etc.
　　
　　(1) All drains and sewers under a building shall be laid in straight lines and shall be laid with cast iron sewage pipes.
　　
　　(2) Where any drain or sewer is laid through any building, or where any building is constructed over any drain or sewer, relieving arches or beams shall be provided to protect such drain or sewer and to prevent any load from the building being transmitted to such drain or sewer.
　　
　　Cap 123I reg 55 Manholes and cleaning eyes to be provided
　　
　　(1) Manholes shall be provided-
　　
　　(a) at every change in direction in any drain or sewer except where-
　　
　　(i) the change in direction does not exceed 45 degrees;
　　
　　(ii) the internal radius of the bend is not less than 6 times the internal diameter of the drain or sewer; and
　　
　　(iii) the change in direction is made by means of a purpose-made pipe; and(b) at changes of gradient, if the Building Authority so requires.(2) Manholes or cleaning eyes shall be provided at intervals not exceeding 60 m in every drain and sewer. (L.N. 294 of 1976)
　　
　　Cap 123I reg 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)
　　
　　Cap 123I reg 57 Disconnecting traps
　　
　　Remarks:
　　
　　Amendments retroactively made - see 29 of 1998 s. 29
　　
　　(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.
　　
　　Cap 123I reg 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.
　　
　　Cap 123I reg 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.
　　
　　Cap 123I reg 60 Filling in of drainage trenches

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