Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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An Experimental Study for Drainage Capacity Increment at Surcharged Square Manholes

과부하 사각형 맨홀의 배수능력 증대에 관한 실험적 연구

  • 김정수 (경기대학교 대학원 토목공학과) ;
  • 송주일 (경기대학교 대학원 토목공학과) ;
  • 윤세의 (경기대학교 대학원 토목공학과)
  • Received : 2008.08.28
  • Accepted : 2008.11.17
  • Published : 2008.12.15
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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

Acknowledgement

Supported by : 한국건설교통기술평가

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