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http://dx.doi.org/10.3741/JKWRA.2017.50.12.877

Development of head loss coefficient formula at surcharged four-way combining square manhole with variation of inlet flow  

Jo, Jun Beom (Department of Civil Engineering, Kyonggi University)
Kim, Jung Soo (Department of Civil Engineering, Bucheon University)
Yoon, Sei Eui (Department of Civil Engineering, Kyonggi University)
Publication Information
Journal of Korea Water Resources Association / v.50, no.12, 2017 , pp. 877-887 More about this Journal
Abstract
The energy losses due to surcharged flow at four-way combining manhole, which is mainly installed in the downstream of urban sewer system, is the main cause of inundation in urban area. Surcharged four-way combining manholes form various flow configuration such as straight through, T-type, and four-way manholes depending on variation of inflow discharge in inlet pipes. Therefore, it is necessary to analyze change of energy loss and estimate head loss coefficients at surcharged four-way combining manhole with variation of inflow discharge ratio. The hydraulic experimental apparatus which can change inflow ratios were installed to analyze the flow characteristics at four-way combining manhole. In this study, to calculate the head loss coefficient according to change of the inflow discharge ratios at the surcharged four-way combining square manhole, the discharge conditions of 40 cases which the inflow ratios of each inlet pipe were changed by 10% interval was selected. The head loss coefficient at surcharged square manhole showed the lowest value of 0.40 at the straight manhole and the highest value of 1.58 at the $90^{\circ}$ junction manhole. In the combining manholes (T-type and four-way), the head loss coefficients were calculated more higher as the lateral flow rate was biased. The contour map of head loss coefficient range was constructed by using the estimated head loss coefficients and the empirical formula of head loss coefficients was derived to consider the variation of inflow discharge ratios at the surcharged square manhole. The empirical formula could be applied to the design and assessment of the urban drainage system.
Keywords
Four-way combining manhole; Head loss coefficient; Inflow discharge ratio; Urban drainage system;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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