Manholes

Precast concrete manholes are an integral component of any modern sewer system. A properly designed and installed precast concrete manhole system provides superior watertight performance compared with competing methods and materials. A typical precast concrete manhole can be installed 500 feet deep and more, because lateral forces act equally around the periphery, which places the section in pure compression – the ideal state for concrete. Precast concrete manhole sections are produced in a controlled environment, thus exhibiting high quality and uniformity.

This Web page content has been developed by the NPCA Manhole Product Committee.

Manhole Product Promotional Sheet (PDF)

Vacuum Testing Advisory (PDF)

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MC Magazine, September/October 2004, "Knowing when to restrain pipe"