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http://dx.doi.org/10.15681/KSWE.2016.32.4.367

Assessment of Design Method about Sanitary Sewer Network according to RDII and Established Scenario  

Kim, Jungryul (School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang University)
Oh, Jeill (School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang University)
Publication Information
Journal of Korean Society on Water Environment / v.32, no.4, 2016 , pp. 367-374 More about this Journal
Abstract
In this study, the RDII impact on sewer designing in the upstream monitoring area (A site) was considered. Based on the long-term (1/1/2011~12/31/2011) rainfall and flow data consisting of 10-min interval sampling in the nearby design area (B site), the maximum RDII/DWF ratio was selected. The sewer network system at B site was evaluated by the Manning equation. Scenario 1 considering the hourly maximum flow with respect to the flow velocity showed that none of the sewer pipes satisfied the minimum flow velocity condition (0.6 m/s), and 40 pipes did not achieve half of the velocity condition. In scenario 2 considering I/I, 1 the pipes satisfied 0.6 m/s, and 35 pipes showed 0.3 m/s. Scenario 3 reflected the effect of RDII. Velocities in 26 pipes were less than 0.3 m/s, and 4 pipes satisfied the velocity condition. With respect to the allowance rate, 17 pipes were shown to have more than 99%, and none of the pipes satisfied less than 95% of the allowance rate in scenario 1. In scenario 2, 17 Ed: Per the Table pipes showed more than 99% and one pipe showed less than 95%. In scenario 3, 16 pipes showed more than 99% of the allowance rate, and 19 pipes showed less than 95%. Based on these results, it is predicted that deposition would occur due to the slow flow velocity; however, capacity would not be a problem.
Keywords
Rainfall-Derived Inflow/Infiltration; Sanitary Sewer Systems (SSSs); Sewer Design Analysis; Sewer Network;
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