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First, a storm water runoff simulation model of surcharged flow with masses of air at manholes in urban sewer pipe systems is proposed. In this model, the compressibility of the air is considered.Second, the model is applied to runoff experiments in a hydraulic model of storm sewer pipes with manholes, and the air-pressure hydrographs simulated by the simulation model are compared to the observed ones.As a result, it is demonstrated that the simulation model proposed here can simulate very well the temporal variations in air-pressure at manholes.

PRESSURISED-FLOW WITH MASSES OF AIR AT MANHLOES IN URBAN SEWER PIPE SYSTEMS