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Creating a Tight Sewer System and Proving It – A Case Study Scio Township, Michigan

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Scio Township desired to conduct a pilot manhole rehabilitation program to determine the effectiveness of inflow and infiltration (I/I) removal from sanitary sewer manholes. Rehabilitation was conducted in the spring of 2006 and involved rehabilitating 48 manholes in Scio's Washtenaw Intermediate School District (WISD) area. Although this district is Scio's highest area of I/I, compared to other communities, it is a drier system with relatively low peaking factors and capture rates. However, due to limitations in outlet capacity and to create capacity for planned development, it was necessary to make this tight system even tighter.

In the fall of 2006 the Township installed meters to monitor the post-rehabilitation flow from this district. The results of this metering were compared to the 2003 pre-rehabilitation metering to quantify the effectiveness of the I/I removal. In order to perform this comparison, it was necessary to have an accurate method of evaluating the flows, which were collected during different seasons and different antecedent moisture conditions. This paper will review the manhole rehabilitation program and discuss how these challenges were addressed.
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Document Type: Research Article

Publication date: 2008-01-01

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