Rehabilitation in Northeast Ohio Northeast Ohio Regional Sewer District uses cementitious liners in manhole restoration project. By James W. Rush. Manhole Infiltration Reduction Chemical grouting in New Jersey successfully stops infiltration caused by Hurricane Floyd. By N. H. Bennet. Louis M. Carrara Nothing in life lasts forever.
Manholes are no exception.
Regardless of how well constructed, the efficiency and the structural integrity of manholes will eventually begin to decline. The deterioration usually occurs in the area of the manhole chimney just below the casting. Mich. Manholes is this area are commonly affected by freeze-thaw cycles in addition to traffic loading. The structural breakdown of a manhole can cause excessive groundwater flow into the structure, and subsequently, into wastewater and flood water systems. Extraneous groundwater in a wastewater system translates directly to additional costs to taxpayers in the form of treatment costs at the wastewater treatment facility.