Abstract
Infiltration and/or inflow (I/I) into a collection system often causes hydraulic overloads at the associated treatment plant. The impacts from I/I can become especially severe in areas with unstable soil conditions and deteriorating sewer systems. I/I can (a) result in increased operation and maintenance costs and (b) cause overflows and bypasses of untreated wastewater within the collection system during wet weather conditions. A major reason for I/I flows is improper installation and degradation of privately owned sewer lines as well as illegal or improper private connections. Previous studies have indicated that a large percentage of I/I flows are the result of defective sewer lines on private property. This article presents a computer model that has been developed as a comparison and/or decision-making tool to predict the reduction of sanitary sewer overflows and private property I/I for various rehabilitation approaches.
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