wobstruction
available
PUBLIC HEALTH . 1003
[ 24 of 1887. ]
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16. Whenever the ſgradient of any portion of aa drain is less than one in Fall to drains
thirty, the Sanitary Board may in its discretion require an automatic flush and flush .
tank or any other suitable contrivance for attaining an effective flush to
be used .
17. All changes of direction in house -drains shall be made by means of Change of
properly curved pipes or by half channels in manlioles and between the direction .
points at which any change of direction occurs all house -drains shall be laid
in straight lines and regular grades from point to point.
NOTE.— (Inasmuch as changes of direction are the points at which ohstructions most
frequently occur, and for the purpose of removing obstructions generally, house-holders
will do well to provide, at each change of direction, a manhole, giving access to the
drain. For this purpose the manhole should be made 3' 0" X 1 6' to the surface or to a
depth of five feet above the drain. Beyond this depth the manhole may be narrowed to
16" X 16 "). But such manhole should not be found in cook -houses or in places where
they may be opened and used as receptacles for the disposal of solid rubbish ,