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Statistical Methods for the Use of Infiltration and Inflow as Performance Index in Sewer Rehabilitation Works  

Kim, Hyung-Joon (중앙대학교 토목공학과)
Park, Kyoo-Hong (중앙대학교 토목공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.24, no.5, 2010 , pp. 617-628 More about this Journal
Abstract
The operation performance of sewer rehabilitation projects conducted with Build-Transfer- Lease contract in Korea will be evaluated using the index of infiltration and inflow (I/I). Though I/I obtained at the fourth year should be initially evaluated based on the I/I values observed for the previous three years after the completion of sewer construction, the concrete methodology have not been proposed to rely on the so called 'performance evaluation committee'. This study suggests two statistical methodology to evaluate the I/I performance; the confidence interval method and the hypothesis-testing method. Assumed ten I/I values in each year for 20 years are used in this study. Two cases are analyzed and compared; case I to use as control data all I/I values for all years obtained before the evaluation year and case II to use I/I values for only 3 years before the evaluation year. As a result, case II tends to have relatively higher scores than case I, reflecting the low mean I/I values at the initial years.
Keywords
infitration/inflow; sewer rehabilitation; statistical methods; confidence interval; hypothetical test;
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