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THE HONGKONG GOVERNMENT GAZETTE, FEBRUARY 12, 1910.
18. The aggregate area of the openings in any grating fixed on the inlet to a waste-pipe from a bath or sink shall not be less than four square inches and such waste-pipe shall not have a less internal diameter than 1 inches.
19. Every inlet to a drain or sewer shall be provided with a trap of a pattern to be approved by the Building Authority. All surface traps and gulleys shall be provided with hinged gratings having the nett area of the openings not less than twice the area of the trap or pipe. Such gratings shall be sunk to a depth of at least one inch below the surrounding surface with a slope round them equal to half the width of the grating.
20. Traps shall have not less than two inches of water seal and shall be properly fixed and jointed to the satisfaction of the Building Authority. All stoneware traps shall be surrounded with four inches of concrete as specified in regulation 8.
21. No person shall construct or fix in connection with any drain or waste-pipe the form of trap of the kind known as the Belltrap or any trap of the kind known as the D trap.
22. Every covered main drain or sewer carrying sewage or sullage water shall be ven- tilated at its upper end by carrying up in the open air an iron ventilating pipe of a diameter of not less than four inches to a height of not less than three feet above the eaves of this or of any of the immediately adjoining buildings, and clear of all windows, skylights or other openings. The joints of all such pipes shall be properly caulked and run with lead.
23. Every covered main drain or sewer carrying sewage or sullage water shall have a ventilating opening near to its lower end and in the open air, and no trap or other obstruction to the free circulation of air shall exist between this opening and the one described in the preceding regulation.
When a covered main drain receives the drainage of more than one building the Build- ing Authority may require additional provision for ventilation of the branch drain from each building.
24. All eaves gutters shall be of cast iron or other material approved by the Building Authority and shall be securely fixed at a proper gradient and connected to rain-water pipes to the satisfaction of the Building Authority.
25. Rain-water pipes and waste-pipes from baths, sinks and other similar appliances on the upper floors of buildings shall be fixed, as far as may be practicable, vertically and shall be of cast iron socketted pipes jointed with cement, or wrought iron pipes, with screwed joints, coated with bituminous composition, or galvanised, or of well glazed stoneware socketted pipes, or other approved materials, securely fixed outside the wall, and in the open air, by means of wrought iron bands fitted round the pipe, and made fast with wrought iron spikes not less than four inches long, or in the case of iron pipes by means of ears, made fast as above described and provided, at each point of connection, with a suitable head, and at their lower extremity with a bend, shoe or pedestal pipe. Every opening in the wall of a building for the discharge of sullage water shall be of a suitable size and entirely protected to the satisfaction of the Building Authority by a fixed grating of east iron or other material to be approved by the Building Authority.
Provided that in the case of rain-water pipes and waste-pipes abutting on any street, cast or wrought iron pipes only shall be used, properly jointed as above described, (unless permission has been granted by the Building Authority to use pipes of other material), and wherever practicable rain-water pipes shall be carried under the. foot-path and shall discharge into the side channel. All joints of stoneware pipes shall be made in the manner provided by No. 3 of these regulations.
NOTE.-Zinc, tin-plate, rivetted or lap-jointed sheet-iron will not be permitted.
26. No waste-pipe (other than a soil pipe from a water-closet or urinaly and no rain-water pipe shall be connected directly with any covered drain, but every such pipe shall be brought down to within one foot from the ground and shall discharge in the open air near to or over a trap.
27. No rain-water pipe from the roof of a building shall be used as a ventilating pipe for any drain which communicates or is designed to communicate with a sewer.
28. Any person who may have laid any drain or sewer or constructed drainage works connected therewith shall not cover up such drain, sewer or works until the same shall have been previously inspected and passed by the Building Authority or an officer deputed by him, and every such persun shall give three clear days' written notice to such Authority that such drain or sewer or works are ready for inspection, and such notice shall be delivered at the office of the Building Authority in a form of which printed copies in English and Chinese may be obtained gratis on application at the office of the Build- ing Authority, or, in the case of villages, at any village Police Station between the hours of 10 a.m. and 4 pan. Provided that in all cases where plans or a notice signed by an authorized architect have been submitted under regulation 1, the notice referred to in this regulation shall, if the Building Authority so require, be signed by an authorized architect.
29. Before any drain or sewer is covered in it shall be inspected and tested by the Building Authority or an officer deputed by him to ascertain whether it is watertight and air-tight; and no drain or sewer that fails in either of these respects shall be passed. A fee of ten dollars shall be paid by the person who signs the notice referred to in the preceding regulation for every inspection after the first if the Building Authority is satisfied that such further inspection has been necessitated by negligence or by bad workmanship or the use of improper materials. After a drain or sewer has been passed, the earth shall be carefully filled in, above and around the drain or sewer, and thoroughly rammed and consolidated. For a depth of at least six inches, above the summit of the sockets of the pipes, selected material, free from stones larger than will pass through a 2-inch ring, shall be used in filling in the trench.
30. Surface channels shall be constructed of impervious materials to be approved by the Building Authority and of such section as the Building Authority may approve and shall be finished off smooth and laid to regular gradients of not less than one in eighty unless the Building Authority shall permit a less gradient.
31. The floors of all kitchens, seulleries, bathrooms, stables, cow-sheds and the like, shall, where practicable, be laid to proper falls, and shall be elevated above the ground outside the building, and shall be provided with surface channels passing out through the wall and delivering above a trapped gulley outside. When new drains are being laid and where the floor is at the level of the ground outside, such surface channel shall be connected to a trap outside the house by a straight pipe terminating above the water- level and below the grating of the trap, which shall be accessible and in free communica- tion with the open air. Every such opening in the wall shall be of a suitable size and entirely protected by a fixed grating, at its upper end, to the satisfaction of the Building Authority.
32. All surfaces of back-yards and paved areas of premises wherever practicable shall have a fall towards the trap or inlet of the drain of not less than one in forty, and such ⚫ inlet shall be placed as far from the walls as practicable.