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Manholes

Below ground wastewater and stormwater sewer piping require access openings at certain intervals to allow for access, connection points, and change-in-direction points. A “Manhole” is used for these activities. The Manhole is a belowground round or square structure made of precast concrete. Sewer piping connects near the bottom of the manhole structure. At the street level, an iron access cover (often referred to as a “manhole cover”) is placed to permit access.

a.  Sanitary Sewer Manholes:

This manhole is used on sanitary sewer lines for the conveyance of sanitary sewer. The Sanitary Sewer Manhole is typically 48” diameter and varies in depth according the depth of the sanitary sewer. At the bottom of the manhole and at the pipe connections of the sewer, a channel (also called an “invert”) is formed so that the sewer flow is smooth and unimpeded. Since sanitary sewer can be corrosive, interior liners can be specified to the manhole interior.

b.  Stormwater Manholes:

This manhole is used on stormwater sewer lines for the conveyance of rainwater. The Storm Sewer Manhole is generally characterized by a larger size, which is dictated by the sewer pipe connection sizes and orientation. Sizes of Storm Sewer Manholes can range from 48” to 120” diameter and will vary in depth according the depth of the storm sewer.

Applications:
The manholes are units designed for access to an underground utility vault. This product is widely used as an access point for making connections, inspections, valve adjustments, or to perform maintenance on underground utility vaults. They can be seen in either stormwater or wastewater applications, being generally found in urban areas, streets, and sidewalks. ParkUSA also offers custom manhole units in order to be suitable on almost any application.

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