Manholes

7.4.7.3.

  1. A manhole including the cover shall be designed to support all loads imposed upon it.
  2. A manhole shall be provided with
  1. a cover which shall provide an airtight seal if located within a building:


  1. a rigid ladder of a corrosion resistant material where the depth exceeds 1000 mm:


  1. a vent to exterior if the manhole located within a building:

Note:

the size of the vent is not actually pointed out in the Code. Obviously the Article 7.5.5.5.(10) may be applied that states:

where a vent pipe passes through a roof or an outside wall of a building it shall be increased to a minimum size of 3" before penetrating the roof or wall.


  1. A manhole shall have a minimum horizontal dimension of 1 200 mm, except that the top 1 500 mm may be  tapered from 1 200 mm down to a minimum of 600 mm at the top:


  1. A manhole in a sanitary drainage system shall be channelled to direct the flow of effluent:



7.4.7.2.

  1. The spacing between manholes serving a building sewer
  1. 24" or less in size shall not exceed 90 m:




24" or less





  1. over 24" in size shall not exceed 150 m:









over 24"



  1. The developed length of a building sewer between the building and the first manhole to which the building sewer connects shall not exceed 30 m:


  1. Manholes shall be located at all junctions, all changes in grade, size or alignment (except for curvilinear alignment) on a sanitary building sewer:



  1. Manholes shall be located at changes in grade, size or alignment (except for curvilinear alignment) on a storm building sewer.
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