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A Study of Sewer Layout to Control a Outflow in Sewer Pipes  

Kim, Joong-Hoon (고려대학교 건축.사회환경시스템공학과)
Joo, Jin-Gul (고려대학교 건축.사회환경시스템공학과)
Jun, Hwan-Don (한밭대학교 토목공학과)
Lee, Jung-Ho (고려대학교 부설 방재과학기술연구센터)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.9, no.1, 2009 , pp. 1-7 More about this Journal
Abstract
Most developed models are designed to determine pipe diameter, slope and overall layout in order to minimize the cost for the design rainfall for the optimal sewer layout. However, these models are not capable of considering the superposition effect of runoff hydrographs in the sewer pipes. The flow characteristics in the sewer pipes, such as the sewer layout, pipe diameter and slope, vary according to the design of the sewer system. In particular, when the sewer network is modified, the shapes of the runoff hydrographs in the sewer pipes also change because of the superposition effect. In this study, the sewer layout is designed to control and distribute the flows in the sewer pipes, while considering the runoff superposition effect, in order to reduce the inundation risk at each junction. This is accomplished by separating the inflows that enter into each junction by changing the way in which pipes are connected between junctions. And this model combines SWMM (Storm Water Management Model) to perform the hydraulic analysis for the flows in the sewer network. The current sewer layout was modified to minimize the peak outflow at outlet in Garak basin, Seoul, South Korea. As the results, the peak outflows at the outlet were decreased by approximately 20% for the design rainfall during 30 minutes and the total overflows were also decreased for the excessive rainfalls.
Keywords
Sewer layout; Inundation risk; Superposition effect;
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