(1)
A manhole, including the cover shall be designed to support all loads imposed upon it.
(2)
A manhole shall be provided with
(a)
a cover that provides an airtight seal if located within a building,
(b)
a rigid ladder of a corrosion-resistant material where the depth exceeds 1 m, and
(c)
a vent to the exterior if the manhole is located within a building.
(3)
A manhole shall have a minimum horizontal dimension of 1.2 m, except that the top 1.5 m may be tapered from 1.2 m down to a minimum of 600 mm at the top.
(4)
A manhole in a sanitary drainage system shall be channeled to direct the flow of effluent.