the-ordinances-of-the-legislative-counci-1890v4 — Page 394

ORDINANCE No. 24 OF 1887 . 2211


Public Health.


6. House-drains shall be firmly bedded in selected material free from large stones
and well rammed into place.

7. All stoneware pipes shall be well glazed and free from cracks and flaws and Materials, stone
ware pipes.
shall have a thickness of not less than one twelfth of their diameter .

8. Disconnecting chambers shall be red brick manholes fitted with stoneware traps Materials,
disconnecting
and ventilating grates of iron or stone. chambers.

9. Lime mortar used for the building of manholes shall be composed of three Materials, lime
mortar.
parts of sand or red earth and one part of good lime .

10. Lime concrete used for encasing new drains shall be composed of four parts of Materials, lime
Concrete.
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.

11. Cement mortar used for the jointing of pipes or any other work shall be mixed Materials,
cement mortar.
in the proportions of three parts of clean sharp sand and one part of good Portland
cement and used fresh.

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 Size of drains.

drain 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.

14. Every house-draiu shall have the maximum fall throughout its length, that Fall to drains.

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 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.

(b) That the excavation , necessary to obtain the maximum available fall, is
not of such a nature 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.

15. Whenever a reduction of fall, (below the standard grade 1 in 30) is necessary Fall to drains.

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-drain, 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 46 ·66, than to give an uniform fall throughout.