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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 inspected 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 ten dollars shall be paid by the person who signs the notice referred to in regulation No. 30 of these regulations 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 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.
32. Surface channels shall be constructed of im- pervious 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 1 in 80 unless the Building Authority shall permit a less gradient.
33. The floors of all kitchens, sculleries, bathrooms, stables, cowsheds and the like, shall, where practic- able, 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 cutside. 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 communication 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.
34. All surfaces of backyards and paved areas of premises wherever practicable shall have
a fall towards the trap or inlet of the drain of not less than 1 in 40, and such inlet shall be placed as far from. the walls as practicable.
35. Open surfaces such as backyards, courtyards or other spaces on which slops are thrown, or from which foul waters flow, shall be provided with trapped connexions to the covered drains for the removal of such waters as well as some of the rain-water.
36. Wherever an outlet is available, surface. channels shall be provided to carry excessive rainfall from the premises, and these channels shall be pro- perly connected with a storm water-channel or drain. As many four inch traps as the Building Authority may approve shall be placed in such surface channels and connected with the covered drains for the purpose of flushing the sewers.