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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 water flow, shall be provided with trapped connexions to the covered drains for the re- moval 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 properly 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.
37. The rain-water from roofs which slope towards inclosed courtyards or backyards may, if diversion to the surface channel is impracticable, be received into the covered drains, but no ventilat- ing pipe shall be used for the conveyance of rain-water from the roof.
38. No person shall, where it can possibly be avoided, lay any pipe for conveying sub-soil drainage in such manner or in such position as to communicate directly with any sewer, cesspool, or covered drain used for the conveyance or reception of sewage.
39. In every case where the course of a drain or sewer shall be diverted, any cesspool previously existing and into which such drain or sewer may have previously emptied, shall be cleansed, deo- dorized and filled with clean earth.
40. Every water-closet and urinal in a building shall, unless exempted by the Building Authority, be constructed against an external wall, and all apparatus shall be fixed as near to such external wall as in the opinion of the Building Authority is practicable.
41. Every water closet and urinal shall be furnished with a separate cistern or flushing box unless the Building Authority shall otherwise permit. In the case of water closets such cistern or flush- ing box shall be so constructed, fitted and placed as to admit of a supply of water to such closet, basin, or other receptacle of not less than two gallons and not more than three gallons each time such basin or other receptacle is used.
Such cistern or flushing box shall in all cases, except where it is in connexion with a valve-closet, be of the type known as Water Waste Preventor.
Such cistern shall be provided with a suitable ball-cock fixed on the supply pipe, and it shall be furnished with an overflow pipe carried through the external wall of the building into the open air and terminating in a conspicuous place.
Provided that, in the case of trough water closets and urinals, such cistern or flushing box shall be of automatic action and of such size and pattern and discharging at such intervals as may be ap- proved by the Building Authority.
42. Every water closet and urinal shall be furnished with a suitable apparatus for the effectual application of water to any basin, or other receptacle with which such apparatus may be connected and used, and for the effectual flushing and cleansing of such basın or other receptacle, and for the prompt and effectual removal there from of any solid or liquid filth which may from time to time be deposited therein.
Every water closet or urinal shall be furnished with a basin or other suitable receptable or receptacles of non-absorbent material, and of such shape, capacity, and mode of construction as to receive a sufficient quantity of water; and every such receptacle in con- nexion with a water closet shall in addition contain
a sufficient quantity of water to allow of all filth which may from time to time be deposited therein to fall directly into the water. receptacle shall be provided with a suitable trap, having
Every such a water seal of not less than one and a half inches.
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No container or other similar fitting shall be constructed or fixed under such receptacle.
No trap of the kind known as the D trap shall be constructed or fixed in connexion with any such water closet or urinal apparatus.
43. No water closet or urinal or receptacle shall be directly con- nected with any water service pipe.
44. No flush-pipe connecting any water closet apparatus with the cistern shall be less than one and a quarter inches in internal diameter throughout its length and no flush-pipe in connexion with any urinal shall be less than three-quarters of an inch in internal diameter throughout its length.
45. No water closet or urinal apparatus or receptacle shall be cased in.
48. Every water closet and urinal shall be provided with an efficient soil pipe of cast-iron or wrought-iron securely fixed to the wall in the manner described for ventilating and waste-pipes; and such soil pipe shall be not more than (unless required by the Build- ing Authority) four inches in diameter in the case of water closets and not more than (unless required by the Building Authority) two inches in diameter in the case of urinals, and shall be properly con- nected to the drain at the foot, and shall be continued up in full diameter without bends or angles except where unavoidable, and shall terminate in an open end at least three feet in height above the eaves of the building to which it is affixed or of any adjacent building, and not less than ten feet from any window.
Such soil pipe shall be jointed with yarn and molten lead and well caulked.
Every soil pipe shall be provided with proper junctions for con- necting with the water closet or urinal receptacle, the trap of which shall be connected in a sound and substantial manner. No soil pipe shall receive any pipe other than that from a water closet apparatus or urinal, and no trap shall be fixed in any portion thereof.
Every soil pipe shall be fixed throughout its entire length out- side the building in the open air.
47. When more than one trap for a water closet or urinal re- ceptacle is connected with a soil pipe, the trap of each and every such receptacle shall be provided with an air-pipe of cast iron or lead not less than one and a quarter inches in diameter in the case of urinals and not less than two inches in diameter in the case of water closets, which shall be carried up throughout its entire length outside the building, and shall either be connected to the soil pipe above the connexion with the uppermost trap, or shall terminate not less than three feet above the eaves of the building and not less than ten feet from any window.
48. All joints, pipes, fittings and apparatus in connexion with any water closet or urinal shall be perfectly water-tight and air-tight, and fixed to the satisfaction of the Building Authority.
49. All drains, sewers, and drainage works shall be built and carried out in all respects in accordance with the provisions of the Buildings Ordinance, 1935, and of these regulations and of any that may be made hereafter, and if no written notice provided by re- gulation No. 3 of these regulations shall have been given to the Building Authority by any owner or occupier about to construct, reconstruct, alter, repair, or amend any drain or sewer on his pre- mises, and if by such default the Building Authority shall have had no opportunity of inspecting and approving or disapproving of any such drain, sewer or drainage works actually built and already cover- ed in, it shall be lawful for the Building Authority on discovering the existence of such drain or drainage works to call upon such owner or occupier to open and uncover the same for the purpose of inspection, and should such drain, sewer, or drainage works prove upon inspection to be defective either in respect of design, work- manship, or materials, they shall be deemed a nuisance under the aforementioned Ordinance and dealt with accordingly.
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