THE HONGKONG GOVERNMENT GAZETTE, 18TH OCTOBER, 1890.
26. Every main house-drain shall have a ventilating opening near to its lower Ventilation. end and no trap or other obstruction to the free circulation of air shall exist between this opening and the one described in the preceding bye-law.
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If there be a trap between the house-drain and the public sewer, opening shall be made on the house-side of the trap, and the said opening shall be so arranged as to give access to the trap for inspection, cleansing or repair.
If there be no trap between the public sewer and the house-drain no special opening need be provided at the lower end.
27. Drains leading from a single trap and not being more than sixty feet long, Ventilation. need not be provided with an elevated ventilating opening at their upper end but if this be omitted, they shall be provided with a trap, disconnecting them from the public sewer, and shall have a ventilating opening at the lower end on the house- side of the trap.
28. Ventilating and fall pipes of stoneware shall be securely fixed to the Ventilating-pipes. exterior surfaces of walls with wrought iron bands fitted round the pipe and made fast to the wall with two wrought iron spikes not less than four inches in length. Metal pipes shall also be fixed as above or shall have two ears fixed to them and secured to the wall with two wrought iron spikes, not less than four inches long.
29. Down-pipes, conveying rain-water from roofs, shall be constructed of Down-pipes. cast or welded wrought-iron, and when the down-pipe discharges into the house- drain it shall be completely disconnected therefrom, as described in bye-law No. 31 and fitted with a bend, shoe or pedestal pipe. Wherever practicable, the rain-water down-pipes on the street side of buildings, shall be carried under the footpath and discharge into the side-channel.
NOTE. It is most important that such pipes should be completely disconnected from the sewers so that they cannot by any possibility serve as conduits for conducting sewer air up and into the dwelling.
30. Waste-pipes from baths, sinks and other similar appliances, on the upper Waste-pipes. floors of buildings shall be of cast-iron socketted pipes or wrought-iron welded- pipes with screwed joints coated with bituminous composition, or in the case of wrought-iron, galvanised; or of well glazed stone-ware socketted pipes, or other approved materials, securely fixed outside the wall, and provided, at each point of connection, with a suitable head, and at their lower extremity with a bend, shoe or pedestal pipe. All joints of stoneware pipes to be made in the manner provided for in bye-law 5.
NOTE-Zinc, tin-plate, rivetted or lap-jointed sheet-iron will not be approved.
31. Waste-pipes, as well as down-pipes from roofs, shall not be connected Waste-pipes. direct with any drain but shall discharge in the open air near to or over a trap and they shall be brought down to within one foot or less from the ground.
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32. No rain water-pipe from the roof of a building shall be used as a ventila- Rain-water pipes. ting shaft to any drain which communicates or is designed to communicate with a public sewer.
NOTE. Rain water-pipes terminate at the eaves of the house a point not high enough above windows to be a safe ventilating outlet.
33. Any person who may have laid any new drain or constructed new drainage Covering up drains.
works connected therewith shall not cover up such drain or works until the same shall have been previously inspected and passed by the Board, and such person shall give three clear days' written notice to the Board that such drain or works are ready for inspection, and such notice shall be delivered at the Office of the Board in a form of which printed blank copies may be obtained gratis in English and Chinese on application at the Office of the Board, or in the case of Villages-at any Village Police Station, between the hours of 10 A.M. and 4 P.M.
34. Before any drain is covered in, it shall be inspected and tested to ascer- Inspection of drains. tain whether it is water or air-tight; and no drain that fails in this respect shall be passed. After inspection, the earth shall be carefully filled in, above and