A Study on First Flush Storage Tank Design for Combined Sewer Overflows (CSOs) Control

합류식하수도 월류수 관리를 위한 초기우수 저류조 설계방안 연구

  • Son, Bongho (Railroad & Soil Environment Research Center, Woosong University) ;
  • Oa, Seongwook (Department of Railroad, Civil & Environmental Eng. Woosong University)
  • 손봉호 (우송대학교 철도.토양환경연구센타) ;
  • 어성욱 (우송대학교 철도건설시스템학과)
  • Received : 2011.06.08
  • Accepted : 2011.07.13
  • Published : 2011.09.30


One of the best way to control Combined Sewer Overflow (CSO) is proposed to construct first flush storage tank. But there is little known parameters for optimum design of these facilities. This study was conducted to get optimum design parameters for a first flush storage tank construction. The optimization of the tank is generally based upon some measure of SS(Suspended Solid) mass holding efficiency. Water quality deterioration of receiving water body happened right after first time occurring rainfall in dry weather seasons. So, design rainfall intensity is used at 2 mm/hr for peak of monthly average intensities of dry seasons. The capacities for each evaluated catchment are designed from 14.4 min to 16.1 min HRT of CSOs flow at design rainfall intensity. Owing to all storage tanks are connected to interception sewer having a redundancy, the suggested volume could be cut down.


  1. 대전광역시(2007). 대전광역시 하수도정비 기본계획 변경보고서.
  2. 대전광역시(2009). 초기우수처리 시스템 기술개발 연구용역보고서, 대전광역시 시설관리공단.
  3. 박노연(2003). CSOs(합류식 하수관거 월류수) 처리시설의 현황. 대한토목학회논문집, 51(2), pp. 47-54.
  4. 박천표(2007). 도시지역 초기 강우 유출수 관리방안에 관한 연구. 석사학위논문, 부산대학교 산업대학원.
  5. 배유진(2008). 강우 시 토구의 CSOs 발생 특성분석을 위한 기초연구. 석사학위논문, 서울과학기술대학교.
  6. 여중현, 김건하(2005). 도시 소유역에서 하수관거 월류수의 배출특성 연구. 대한토목학회논문집, 25(1B), pp. 254-261.
  7. 조덕준, 김건하(2006). 소규모 도시유역 하수관거 월류수 특성화 및 최적 저류조 용량 결정. 수질보전 한국물환경학회지, 22(2), pp. 314-320.
  8. 조덕준, 이정호, 김명수, 김중훈, 박무종(2007). 도시유역 CSOs 처리를 위한 저류형시스템 설계용량 선정. 수질보전 한국물환경학회지, 23(4), pp. 490-497.
  9. 환경부(2005). 2004 하수도 통계.
  10. 환경부(2011). 하수도 시설기준.
  11. APHA (1998). Standard Method for the Examination of Water and Wastewater. 20th edition, Washington, DC., USA.
  12. Huebner, M. and Geiger, W. F. (1996). Characterisation of the performance of an off line storage tank. Water Science & Technology, 34(3-4), pp. 25-32. https://doi.org/10.1016/0273-1223(96)00552-5
  13. Lape, J. and Dwyer, T. J. (1994). Controlling Combined Sewer Overflows(CSOs); EPA's CSO Control Policy, in Processing of 1994 WERF, Kemtucky Tenn., pp. 10-18.
  14. Stovin, V. R., Grimm, J. P., and Saul, A. J. (2002). Fine sediment retention in storage chamber: an assessment of timedependent effects. Water Science & Technology, 45(7), pp. 123-131.
  15. Van sluis, J. W. (1993). Evaluation of the water quality effects of combined sewer overflow(CSO) control measures. Water Science & Technology, 27(5-6), pp. 177-184.
  16. Welker, A. (2007). Occurrence and fate of organic pollutants in combined sewer systems and possible impacts on receiving waters. Water Science & Technology, 56(10), pp. 141-148. https://doi.org/10.2166/wst.2007.755