流域治水による合流式下水道雨天時越流水の流出抑制に関する研究-東京都善福寺川を事例として-
キーワード:
Combined Sewer Overflow,
Interated watershed management for flood control,
Infiltration facilities
2015 年 21 巻 p. 455-460
詳細
2015 年 21 巻 p. 455-460
Combined Sewer Overflow(CSO) cause severe effect to river environment. In Japan, 200 Urban areas adopt the Combined Sewer and CSO is the nationwide problem.
In this study, We investigated the relationship between intensity of rainfall and number of occurrence of CSO in the Zenpukuji River. And, we developed the outflow simulation model of CSO by using Inforworks ICM. Then, we carried out the simulation on the assumption that infiltration facilities are set in the basins.
As a result, we reveal that over 1.1mm/5min or 2.0mm/10min, 4.3mm/30min, 6.4mm/hr rainfall caused the CSO at the upper reach of the Zenpukuji River. The simulation results indicated that the infiltration facilities can reduce the CSO peak flow when the peak discharge was under 12m3/s at the observation point.
