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An Experimental Study for Drainage Capacity Increment at Surcharged Square Manholes  

Kim, Jung Soo (경기대학교 대학원 토목공학과)
Song, Ju Il (경기대학교 대학원 토목공학과)
Yoon, Sei Eui (경기대학교 대학원 토목공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.6, 2008 , pp. 619-625 More about this Journal
Abstract
Urban sewer systems are designed to operate in open-channel flow regime and energy loss at square manholes is usually not significant. However, the energy loss at surcharged manholes is considered as one of the major causes of inundation in urban area. Therefore, it is necessary to analyze the head loss associated with manholes, especially in surcharged flow. Hydraulic experimental apparatus which can change the manhole inner profile(CASE I, II, III, and IV) and the invert types(CASE A, B, C) were installed for this study. The experimental discharge was $16{\ell}/sec$. As the ratio of b/D(manhole width/inflow pipe diameter) increases, head loss coefficient increases due to strong horizontal swirl motion. The head loss coefficients for CASE I, II, III, and IV were 0.46, 0.38, 0.28 and 0.37, respectively. Side covers increase considerably drainage capacity at surcharged square manhole when the ratio of d/D(side cover diameter/inflow pipe diameter) was 1.0. The head loss coefficients for CASE A, B, and C were 0.45, 0.37, and 0.30, respectively. Accordingly, U-invert is the most effective for energy loss reduction at surcharged square manhole. This head loss coefficients could be available to evaluate the urban sewer system with surcharged flow.
Keywords
head loss coefficient; surcharged flow; square manhole; urban sewer system;
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Times Cited By KSCI : 2  (Citation Analysis)
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