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ing 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 cast-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-iron 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 mate- rial), and wherever practicable rain-water pipes shall be carried under the foot-path and shall discharge into the side-channel.
Note.-Zinc, tin-plate, riveted or lap-jointed sheet-iron will not be permitted.
28. No waste-pipe (other than a soil pipe from a water closet or urinal) 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.
29. No rain-water pipe from the roof of a building shall be used as a ventilating pipe for any drain which communicates or is de- signed to communicate with a sewer.
30. Any person who may have laid any drain or sewer or con- structed drainage works connected therewith shall not cover up such drain sewer or works until the same shall have been previously in- spected and passed by the Building Authority or an officer deputed by him, and every such person 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 Building Authority, or, in the case of villages, at any police station between 10 a.m. and 4 p.m.: Provided that in all cases where plans or a notice signed by an authorised architect have been submitted under regulation No. 3 of these regulations, the notice referred to in this regulation shall, if the Building Authority so requires, be signed by an authorised architect.
31. Before any drain or sewer is covered in, it shall be inspect- ed and tested by the Building Authority or an officer deputed by him to ascertain whether it is water-tight and air-tight; and no drain or sewer that fails in either of these respects shall be passed. A fee of twenty dollars shall be paid by the person who signs the notice referred to in regulation No. 30 of these regulations for every inspec- tion 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 con- solidated. 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 two inch ring, shall be used in filling in the trench.
22. Surface channels shall be constructed of impervious mate- rials 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 1 in 80 unless the Building Authority shall permit a less gradient.
33. The floors of all kitchens, sculleries, 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 out- side, 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 com- munication 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.
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