the-ordinances-of-the-legislative-counci-1890v2 — Page 412

1002 [ 24 of 1887. ] PUBLIC HEALTH .


lanterns kept lighted through the night, and he shall further provide watch
men , erect hoardings and otherwise take such precautions as may be necessary
for securing the safety of the public and the protection of adjoining properties.
Materials and
jointing. 5. House - ulrains shall be made of impervious materials with smooth internal
surfaces, such as well glazed earthen -ware pipes or cast-iron pipes protected
against rust or corrosion by suitable asphaltic coating. The drains shall be
so constructed as to be water or air -tight. In jointing pipes with cement,
tarred -hemp shall be caulked into the joint before the cement is applied, and
care shall be taken that no cement or other jointing material projects from
the joints into the interior of the pipes ; and any such projecting material or
other irregularities in the bore of the drain shall be carefully removed.
6. Ilouse-drains shall be firmly bedded in selected material free from large
stones and well rammed into place.
Materials, stone 7. All stoneware pipes shall be well glazed and free from cracks and
ware pipes .
flaws and shall have a thickness of not less than one twelfth of their diameter.
Materials ,
disconnecting
8. Disconnecting chambers shall be red brick manholes fitted with stone
chambers . ware traps and ventilating grates of iron or stone .
Materials, lime 9. Lime mortar used for the building of manholes shall be composed of
mortar.
three parts of sand or red earth and one part of good lime.
Materials, lime
concrete . 10. Lime concrete used for encasing new drains shall be composed of four
parts of good sound clean stone, broken to half inch cubes, two parts of red
earth and one part of lime thoroughly well mixed and well rammed into
place.
Materials,
cement mortar ,
11. Cement mortar used for the jointing of pipes or any other work shall
be mixed in the proportions of three parts of clean sharp sand and one part
of good Portland cement and used fresh .
Size of drains. 12. No main house -drain shall be less than six inches in clear internal
diameter.
Size of drains.
13. Subject to the limitation mentioned in the preceding bye -law, no main
house-urain shall be larger than is necessary in the opinion of the board to
carry off the sewage of the dwelling, or the sewage with the rain -water,
which , under conditions hereinafter specified in bye -laws Nos. 38, 39, 40
and 41 shall be admitted to the house - drain .
Fall to drains.
14. Every house -drain shall have the maximum fall throughout its length ,
that the relative levels of the public sewer and of the most remote inlet, will
admit of.
Provided always
(a) That the maximum available fall does not exceed one in thirty (or
4 inches in 10 feet .) If it does, then the part of the drain , more
remote from the public sewer, may be laid with a fall of one in
thirty ; and the remainder, with such greater fall as may be
necessary to connect with the public sewer.
(6) That the excavation , necessary to obtain the maximum available
fall, is not of such a pature as to endanger the stability of the
adjoining or neighbouring property.
In these and similar cases the gradient may be reduced subject to the
approval of the board .
Fall to drains. 15. Whenever a reduction of fall, (below the standard grade 1 in 30 ) is
necessary or permissible, it shall, wherever practicable, be made in the portion
of the drain , nearest to the outlet, rather than in the part nearest to the inlet
and in the main trunk of the drain ,, rather than in the branches.
NOTE . - The available fall in a house-crain, 100 feet long, is 2' 6" or one in forty. It
will be better to make the first thirty feet from the inlet, with a fall of 1 foot, or 1 in 30 ;
and the remaining length of 70 feet with a fall of 1 in 16.66 , than to give an uniform fall
throughout.