Inflow and infiltration (I&I) is an unavoidable problem which affects underground infrastructures such as water mains, sewer\nlines, and storm water systems. The additional water and intruded debris, due to I&I, can hinder the flow capacity of the pipe\nnetwork. However, with proper management, such problems can be minimized or controlled. By using a qualitative approach to\ndetermine the areas susceptible to I&I, application of geographic information system (GIS) can minimize cost and time. The\nresults found can highlight the most I&I vulnerable areas, which can be used for underground infrastructure management. In this\nstudy, maps of Youngstownâ??s sewer lines and surrounding areas were generated and used. Pipe age, an empirical operating\ncoefficient, sewer classifications, and soil hydraulics were the parameters used to identify each pipe segments. The results of this\nstudy show that majority of pipelines from downtown and south side of the city were determined to be in very poor conditions.\nThe method used in this study reduces the scale of work, by generating a map, indicating areas with highest susceptibility.
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