SSI - HDPE Manhole Insert- Brochure

Leaking manhole covers are a major contributor to rainfall induced inflow. Sewer evaluation studies indicate that a typical manhole casting will allow an inflow rate from .20 to over 5 gallons per minute during rainfall occurrences. While the manhole cover is one of the leading contributors to collections system I&I; ironically, it is the easiest and most cost-effective problem to remedy.