1044
THE HONGKONG GOVERNMENT GAZETTE, 18TH OCTOBER, 1890.
Floors of cook-houses, &c.
Floors of cook-houses, &c.
Fall of Yards, &c.
Openings into drains in yards, &c.
Surface Channels.
Diversion of rain-water.
Admission of rain-water.
Sub-soil drains.
New drains and cess-pools.
New drains.
around the drain; and thoroughly rammed and consolidated. For a depth of at least six inches, above the summit of the sockets of the pipe, selected material, free from stones larger than will pass through a 2" ring, shall be used in filling in the trench.
35. The floors of cook-houses, stables, cow-sheds and the like, where practicable shall be elevated above the ground outside the dwelling, and 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, the surface-channel of the cook-house, shall be con- nected to a trap, outside the house, by a straight open pipe, terminating above the water-level of the trap, which shall be accessible and in free communication with the air.
36. The floors of cook-houses, latrines, privies, back-yards shall be paved with some impervious and durable material, such as granite setts, or vitrified bricks, laid on a bed of good concrete not less than four inches thick, and pointed with good mortar, or with good concrete laid in a bel not less than six inches thick and rendered with cement, and shall have a fall from the walls to the outlet of at least a inch to the foot.
37. All surfaces of back-yards and paved areas of premises wherever prac ticable shall have a fall, from the walls of the building towards the trap or inlet of the drain, at the rate of not less than an inch to 1 foot, and such inlet shall be placed as far from the walls as practicable.
38. Open surfaces such as back-yards, court-yards or other spaces, on which slops are thrown, or from which foul waters flow, shall be provided with trapped connections to the house-drains, for the removal of such waters, as well as some of the rain-water. But such surfaces shall be properly paved, in the manner prescribed for back-yards and cook-houses, so that no sand or silt may be washed into the drains from them.
39. Wherever an outlet is available, surface channels shall be provided. to carry excessive rain-fall from premises and these channels shall be properly connected with the storm-water channel, in the street. Traps not less than 4 inches in diameter in connection with the house-drain shall be placed in this sur- face-channel, which will carry off slops or sewage, as well as some rain-full.
40. Rain-water shall be diverted from house-drains by means of surface channels or otherwise to the fullest extent practicable.
41. The rain-water from roofs, which slope towards enclosed court-yards, or back-yards, may, if diversion to the surface channel is impracticable, be received into the house-drain. But no ventilating pipe shall be used for the conveyance of rain-water from the roof.
42. No person shall, where it can possibly be avoided, lay any pipe for con- veying sub-soil drainage in such manner or in such position as to communicate direct with any sewer, cess-pool or drain used for the conveyance or reception of sewage.
NOTE-It is important to exclude sewage tainted air from the sub-soil. The connection of sub-soil drains to sewers even if a trap is used is objectionable, because in dry weather the flow of the drain may cease and the water or the trap may dry up and leave a free communication between the sewer and the sub-soil drain. The object of sub-soil drainage is not only the removal of water, but the aeration of the sub-soil. The mouths of such drains therefore should be so placed that pure air can enter freely, a condition incompatable with direct connection with sewers or house-drains.
43. In every case where the course of a new drain shall be diverted, any cesspool previously existing and into which such new drain may have previously emptied, shall be cleansed, deodorized and filled with clean earth.
44. All new drains or drainage works, shall be built and carried out in all respects in accordance with the provisions of Ordinance No. 24 of 1887 and of these Bye-Laws and of ny that may be made hereafter and if no written Notice as provid-