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A Change of Peak Outflows due to Decision of Flow Path in Storm Sewer Network

우수관망 노선 결정에 따른 첨두유출량 변화 분석

  • Lee, Jung-Ho (Department of Civil Engineering, Hanbat National University)
  • 이정호 (국립한밭대학교 토목공학과)
  • Received : 2010.10.05
  • Accepted : 2010.12.17
  • Published : 2010.12.31

Abstract

In the previous researches for storm sewer design, the flow paths in overall network were determined to minimize the construction cost and then, it was not considered the superposition effect of runoff hydrographs in the sewer pipes. However, in this research, the flow paths are determined considering the superposition effect to reduce the inundation risk by controlling and distributing the flows in the sewer pipes. This is accomplished by distributing the inflows that enter into each junction by changing the flow path in which pipes are connected between junctions. In this paper, the superposition effect and peak outflows at outlet were analyzed considering the changes of the flow paths in the sewer network. Then, the flow paths are determined using genetic algorithm and the objective function is to minimize the peak outflow at outlet. As the applied result for the sample sewer network, the difference between maximum and minimum peak outflows which are caused by the change of flow path was about 5.6% for the design rainfall event of 10 years frequency with 30 min. duration. Also, the typhoon 'Rusa' which occurred at 2002 was applied to verify the reduction of inundation risk for the excessive rainfall, and then, the amount of overflows was reduced to about 31%.

Keywords

Storm Sewer Network;Inundation;Excessive Rainfall

References

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