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http://dx.doi.org/10.3741/JKWRA.2010.43.5.445

An Experimental Study for Estimation of Head Loss Coefficients at Surcharged Combining Junction Manholes  

Kim, Jung-Soo (Department of Civil Engineering, Kyonggi Univ.)
Choi, Hyun-Soo (Department of Civil Engineering, Kyonggi Univ.)
Yoon, Sei-Eui (Department of Civil Engineering, Kyonggi Univ.)
Publication Information
Journal of Korea Water Resources Association / v.43, no.5, 2010 , pp. 445-453 More about this Journal
Abstract
Energy loss at manholes, often exceeding friction loss of pipes under surcharged flow, is considered as one of the major causes of inundation in urban area. Therefore, it is necessary to analyze head losses at manholes, especially in case of surcharged flow. Hydraulic experimental apparatus which can change the manhole shape (square, circular) were installed for this study. In the experiments, two inflows ($Q_1,\;Q_2$) were varied from 0 to $4{\ell}$/sec and 15 combinations were tested in total. The flow ratios $Q_2/Q_3$ were varied from 0 to 1 for a total flow $Q_3$ ($Q_3=Q_1+Q_3$) of 2, 3, and $4{\ell}$/sec, respectively. The variation of head losses were strongly influenced by the lateral inflow because the head loss coefficient increases as the flow ratio $Q_2/Q_3$ increases. There was no significant difference of head loss between square manhole and circular one, and also no large variation of head loss as discharges change. The relation equations between K and $Q_2/Q_3$ were suggested in this paper.
Keywords
combining junction manhole; head loss coefficient; surcharged flow; urban sewer system;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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