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Manhole Junction Flow

by Jiri Marsalek, Resident Sci.; National Water Research Institute, 867 Lakeshore Dr., Burlington, Ontario, Canada L74 4A6,


Serial Information: Civil Engineering—ASCE, 1987, Vol. 57, Issue 1, Pg. 68-69


Document Type: Feature article

Abstract:

When a sewer surcharges, a basement floods, or sewage overflows, the likeliest source of the problem is sewer junction manholes. Poorly designed ones act as bottlenecks. Study of a few, relatively small residential storm sewer systems suggests that junction losses typically account for 20-30% of total head losses. This article describes two ways to reduce junction head losses�benching and flow smoothing within the manhole, and increasing sewer diameter near the manhole. Optimally designed benching can reduce headlosses about 25%, and enlarged pipe diameter, up to 50%. The article summarizes the report Head Losses at Selected Junction Manholes, published by the American Public Works Assn., Chicago.

Subject Headings: Sewers | Maintenance hole | Head loss (fluid mechanics) | Storm sewers | Sewage | Pipe sizes | Overflow

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