ORDINANCE No. 24 OF 1887. 2213
Public Health.
18. No drain shall be so constructed as to pass under any building except when Drains under
buildings, &c.
any other mode of construction is impracticable. Any drain passing under a building
shall, whenever possible, be laid in one straight line for the whole distance beneath
such building, and shall be imbedded and incased throughout its entire length in four
inches of good concrete.
Whenever a drain traverses soft or yielding ground, or where water may make its
appearance in the trench, the drain shall be surrounded throughout its entire length
with four inches of good concrete.
The stones composing the matrix of the concrete in both cases shall be of a size
to pass through a half- inch ring.
19. No new drain shall be constructed in such manuer as to allow any inlet to Inlets.
such drain to be placed inside any building on such premises.
20. The aggregate area of the openings in any grating fixed on inlets to waste Size of openings
in gratings.
pipes from baths or sinks shall not be less than four square inches and the waste -pipe
shall not have a less internal diameter than 1 inches.
NOTE. The object of this is to secure an efficient flush.
21. Traps or gulleys for the removal of rain-water shall be provided with gratings Traps.
having the uett area of the openings not less than twice the area of the trap or pipe .
Such gratings shall be sunk to a depth of at least one inch below the surrounding
pavement, with a slope round them equal to half the width of the grating.
NOTE. It is not sufficient to provide pipes of ample diameter there must be openings of sufficient
size to admit the rain to them.
22. Traps at the inlets to drains shall be placed so that the water-level in them Traps.
is not less than one foot below the ground, and such trap shall be placed as low down
as the level of the house-drain or branch will permit of ; provided that the depth be
not more than two feet.
23. Traps shall have not less than two inches of water seal and shall be securely Traps.
fixed to the drain. All stoneware traps shall be surrounded with a thickness of four
inches of lime concrete.
24. No person shall construct or fix in connexion with any new drain or waste Form of traps.
pipe the form of trap of the kind known as the bell-trap or any trap of the kind known
as the D trap and all traps connected with any private drains shall be properly set in
cement mortar to the satisfaction of the Board.
NOTE.- Bell-traps and D traps from their form give rise to deposit of filth difficult to remove by
flushing.
25. Every main house- drain, wherever practicable, shall be ventilated at its upper Ventilation. *
end by an opening, in free communication with the outer air. This opening shall be
placed in such a position, as to render any emanations from it as little obnoxious as
possible.
NOTE. (This is, in most cases, to be done by carrying up a well-jointed pipe, not less than four
inches in clear internal diameter, to some point , above the eaves of the building, which is not in close
proximity to any window or chimney. In the case of rural or suburban tenements, the ventilating
opening may be provided on any eminence, or open space at a distance from the dwelling ; the venti
lating pipe and opening, in this case, being not less than four inches in internal diameter.)