Manhole Takeoff & Pre-Bench Base

Many specifications, such as municipal specifications, explicitly state the minimum manhole diameter allowed based on the diameter of the incoming pipes. However, there are also physical and structural requirements that may require the manhole diameter to be increased based on the quantity and orientation of the entering pipes.

Click the below link to see an illustration of standard maximum allowable pipe diameters for various manhole diameters. If you are unsure what size of manhole would be required for your specific project feel free to contact Inland Pipe’s engineering staff who will gladly assist you.

Manhole Sizing Guidelines for Alberta
Manhole Sizing Guidelines for Manitoba and Saskatchewan