Model experiments were conducted to investigate the performance of a siphon sediment cleansing set (SSCS) for preventing sediment deposition on the combined sewer overflow (CSO) chamber bottom. The results confirmed the effectiveness of siphon suction in sediment removal in the chamber. The sediment scour test revealed that the equilibrium scour depth correlated significantly with the siphon-lift capacity of the SSCS, which was a function of the initial siphon head and the cross-sectional area ratio between the CSO chamber and the siphon.
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