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Fall for sur- face of back- yard, etc.

Connexion

with house- drain and paving of

open surface.

Provision of surface chan- nel for exces-

No. 10.] THE ORDINANCES OF HONGKONG: [A.D. 1901.

37. All surfaces of backyards and paved areas of premises, wherever practicable, shall have a fall, from the walls of the building towards the or inlet of the drain, at the rate of not less than an inch to 1 foot, and and inlet shall be placed as far from the walls as practicable.

38. Open surfaces, such as backyards, court-yards, or other spaces, on which slops are thrown, or from which foul waters flow, shall be provided with trapped connexions to the house drains, for the removal of such water as well as some of the rain-water. But such surfaces shall be properly paved in the manner prescribed for backyards 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 sive rain-fall. connected with the storm-water channel in the street. Traps not less than 4 inches in diameter in connexion with the house-drain shall be placed in this surface channel, which will carry off slops or sewage, as well as some rain-fall.

Diversion of rain-water from house- drain.

Case of diver-

sion being

40. Rain-water shall be diverted from house-drains by means of surface channels or otherwise, to the fullest extent practicable.

rda

41. The rain-water from roofs, which slope towards enclosed ́court- or backyards, may, if diversion to the surface channel is impracticable, be impracticable. received into the house-drain. But no ventilating pipe shall be used for the

conveyance of rain-water from the roof.

Prohibition of pipe for sub- oil drainage

being con- nected with

etc.

sewer,

Cleansing, etc., of cess-

pool in case of diverted drain.

Provision for

of construc-

tion and

42. 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 com municate direct with any sewer, cesspool, or drain used for the conveyance or reception of sewage.

NOTE.-It is important to exclude sewage-tainted air from the sub-soil. The connexion 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 of the trap may dry up and leave a free eda munication between the sewer and the sub-soil drain. The object of sub-soil drainage 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 incompatible direct connexion with sewers or house-drains.

43. In every case where the course of a drain is diverted, any cesspoo previously existing, and into which such drain may have previously emptied shall be cleansed, deodorized, and filled with clean earth.

44. All drains or drainage works shall be built and carried out in trol by Board respects in accordance with the provisions of the Public Health Ordinance

1901, and of these By-Laws and of any that may be made hereafter and no written notice as provided by By-Law 1 has been given to the Board any person about to construct, re-construct, alter, or amend any drain on the premises, and if, by such default, the Board has had no opportunity No. 10 of 1901. specting and approving or disapproving of any such drain actually built

carrying out of drainage

works.