Discs Reduce Manhole Infiltration

by Warren S. O'Sullivan, Asst. County Engr.; New Castle County, Public Wks. Department, Newark, Del.,


Serial Information: Civil Engineering—ASCE, 1975, Vol. 45, Issue 8, Pg. 77-77


Document Type: Feature article

Abstract:

The Department of Public Works for New Castle County, Del., conducted a study of infiltration at their over 30,000 sanitary sewer manholes. The study indicated that up to 60% of their unnecessary inflow could be attributed to the manhole covers. The Department's solution is a sealing disc that is placed below the manhole cover. Installation costs may be amortized in about five years.

Subject Headings: Maintenance hole | Infiltration | Sealing | Sanitary sewers | Inflow | Benefit cost ratios

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