Ventilation.
No trags between ventilated points.
Drains and
sewers under buildings, etc.
Manholes and ckaning eyes to be provided.
Conautiction
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52. (1) Every drain provided for the carriage of foul water shall be ventilated at its highest point by means of a ventilating pipe having an internal diameter of not less than two inches.
(2) Every manhole in which a disconnecting trap is fixed shall be adequately ventilated.
(3) Branch drains shall be ventilated at their highest point, if the Building Authority so requires.
53. No trap or other obstruction to the free circulation of air shall be placed between the ventilation openings at the lower and higher ends of any drain or sewer.
54. (1) All drains and sewers under a building shall be laid in straight lines and shall be laid with cast iron sewage pipes.
(2) Where any drain or sewer is laid through any building, or where any building is constructed over any drain or sewer, relieving arches or beams shall be provided to protect such drain or sewer and to prevent any load from the building being transmitted to such drain
or sewer.
55. (1) Manholes shall be provided-
(a) at every change in direction in any drain or sewer except.
where-
() the change in direction does not exceed 45";
(ii) the internal radius of the bend is not less than six times the internal diameter of the drain or sower; and
(ii) the change in direction is made by means of a purpose- made pipe: and
(b) at changes of gradient, if the Building Authority so requires (2) Manholes or cleaning eyes shall be provided at intervals pol exceeding two hundred feet in every drain and sewer.
56. (0) Every manhole shall be of such size and form as of manholes allow ready access for rodding and shall be constructed of
(a) brickwork in cement mortar at least nine inches in thicknes: (b) concrete grade III at least five inches in thickness; or (c) other approved impervious material.
(2) The foundation of every manhole shall be constructed of concrete not less than six inches in thickness.
(3) Benchings shall be formed above the level of every drainag channel in a manhole to fall towards such channel at a gradient of
one in two.
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(4) The benchings and all the internal faces of every manhole shall be rendered with cement mortar so as to provide a smooth and impervious surface.
(5) Every drainage channel in a manhole shall be not less than half round glazed earthenware or cement rendered, and shall have a diameter not less than that of the largest drainage inlet into and not more than that of the outlet from the manhole.
(6) Every drainage inlet to a manhole shall discharge into the drainage channel therein with properly made bends constructed within the beaching of the manhole.
(0) Every manhole shall be fitted, on a level with the ground surface, with a cast iron airtight cover of adequate strength and approved design:
Provided that every manhole inside or under a building shall be fitted with a double-sealed screwed or bolted cast iron airtight cover.
57. (1) A suitable and efficient disconnecting trap shall be Disconnecting provided for every drain and sewer provided for the carriage of foul traps. water, and for every drain and sewer provided for the carriage of surface water except where such drain or sewer is connected to a stream course or an open nullah.
(2) Except under and in accordance with a permit issued under (GNA. the Summary Offences (Licences and Fees) Regulations, 1953, to occupy 85/58). Crown land thereby, every such trap and the manhole in which it is fixed shall be situated on land owned by the owner or owners of the building or buildings for which the drain or sewer is provided, at a position as near as practicable to the place at which such drain or sewer is connected to a public sewer or, in the case of a drain or sewer. provided for the carriage of surface water, which is connected to a covered nullah, at a position as near as practicable to the nullah.
(3) Every such trap shall be-
(a) fixed within a manhole:
(6) so formed and fixed as to have a water seal of not less than
three inches; and
(c) provided, as an integral part of the trap, with a cleaning eye.
58. (1) Open trapped gullies shall be covered with a suitable Gottes. grating having openings equal to an area not less than the cross sectional area of the outlet of the trap.
(2) Where sealed trapped gullies are used, adequate provision shall be made for the ventilation of the space above the water level of the trap.
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