Simply put, round covers cannot inadvertently fall into the hole.

A shallow manhole is meant for depths of two to three feet. This is sometimes referred to as an inspection chamber, as it is very shallow. It is often chosen for sites near the start of a branch sewer in low-traffic areas.

A normal manhole is the most commonly placed manhole as the name suggests, and is meant for depths of five feet. These pieces can be square or round shaped.

A deep manhole is meant for depths of greater than five feet and is often wider than other manholes, as well. A heavy safety lid is required for deep manholes.

• Water flow rates based upon sewer line use and location
• Sediment volume, density, and re-suspension
• Anticipated surcharge loading on the structure
• Soil bearing capacity below the structure
• Ease of access for future maintenance and/or cleaning

• Unmatched durability and strength
• High quality concrete mix designs
• Documented QA/QC programs
• Easily customizable to meet project needs

Round manholes offer flexibility in the angle of intersecting pipes as well as design advantages. The wall thickness of round manhole structures doesn’t increase nearly as much with increasing depth due to the inherently strong nature of round structures.

The primary advantage of square and rectangular manholes is the ability to accommodate larger pipes intersecting at 90 degree angles without significantly increasing the overall size of the structure.

Basic instructions for typical installation can be found here.

• Excavator or backhoe
• Vibratory compactor and/or sheep’s foot roller
• Any proper bracing that is required
• Sealants, grouts, and mastic as required
• All proper safety equipment and PPE

• Ease and speed of installation
• In-stock availability of many standard sizes
• Customization to fit project needs
• Compelling upfront costs as many required materials are supplied by producers (ie. Sealants, grates, mastic)
• Dedicated and knowledgeable sales staff