Materials for
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(2) Waste pipes from lavatory basins may discharge-
(a) into a suitable drainage channel immediately below the lavatory basins, if such drainage channel discharges into a trapped gully;
or
(b) into a common waste pipe, if the common waste pipe dis charges through a trap and bas adequate means of access for cleaning.
(3) Subject to the provisions of paragraph (3) of regulation 25. waste pipes may be connected to a soil pipe.
13. Every soil fitment shall be constructed of glazed earthenware, soil Auntous. enamelled fire clay or other approved material.
Constraction of water- closet Stments.
Canstruction of trough walerclosets.
Construction of urinal channels.
Flushing water supply
Flushing rim.
Flushing cistern.
14. (1) Every watercloset fitment shall be of such sbape, capacity and mode of construction as to retain a sufficient quantity of water and to receive normal deposits of excrement into such water without undue soiling of the sides of the fitment.
(2) Every watercloset fitment, other than a squatting type fitment, shall be provided with a hinged seat or a suitable seat rim or insel.
15. The channel of a trough watercloset shall be not longer than lifteen feet and shall have an even fall towards the outlet trap of no less than one in thirty.
16. The channels of every stall and trough urinal shall bave ao even fall towards the outlet trap of not less than one in one bundred and twenty and no part of any such channel shall be more than twenty feet from the trap to which it discharges.
17. A system of plumbing shall be provided for the supply of water for flushing purposes to every watercloset fitment, trough waterclost, urinal and slap sink.
18. Every watercloset fitment, bidet, basin-type urinal and slop sink shall be provided with a suitable flushing rim for the effectual Hushing of the fitting.
19. (1) Save as provided in regulation 20, every waterclost fitment, trough watercloset, urinal and slop sink shall be provided with a Bushing cistern.
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(2) Such flushing cistern shall- -
(a) in the case of watercloset fitments and stop sinks-
(i) discharge to the watercloset fitment or slop sink, an each occasion such fitment is used, not less than two and od more than three gallons of water; and
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(ii) be provided with a ball valve so arranged as to re-fill the cistern within two minutes;
(6) in the case of trough waterclosets, be fitted with automatic
discharging apparatus so arranged as to discharge-
(i) at the highest point of the channel;
(ii) at such intervals as may be necessary to ensure adequate cleaning of the closer,
not less than two gallons of water for every three feet of the channel;
(c) in the case of urinala, be fitted with automatic discharging
apparatus so arranged as to discharge-
(i) into every basin or stall or, in the case of a trough urinal, every three feet thereof;
(i) at such intervals as may be necessary to ensure adequate cleaning of the urinal,
not less than one gallon of water.
20. Save in the case of trough waterclosets and urinals, pressure Pressure valves may, where there is a suitable head of water, be installed for valves. flushing purposes without the provision of a flushing cistern.
21. The internal diameter of flushing pipes shall-
Flushing
(a) in the case of watercloset fitments, trough waterclosets and slop pipes.
sinks, be not less than one and a quarter inches;
(b) in the case of urinals (other than trough urinals), be not less
than half an inch for each basin or stall; and
(c) in the case of trough urinals, be not less than half an inch for
every three feel thereof.
22. (1) Storage tanks for waler solely for flushing purposes shall Storage tanks be provided in every building in which watercloset ötments. trough for flushing waterclosets, urinals or slop sinks arc installed.
(2) Every such tank shall→→
(a) at a position above the level of the highest fitment or on a
suitable water tower;
(b) fitted with a suitable closcfitting cover; and
(c) provided with adequate access to enable the tank to be entered
and cleaned.
water.
23. (1) Every flushing cistern and water storage tank shall be Overflow provided with an overflow pipe.
(2) The overflow pipe from a waler storage tank shall-
(a) have an internal diameter not less than twice the internal
diameter of the supply pipe to the tank:
pipes.