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the sewage coverage rate in tokyo ward has reached 100%, however, 80% of this coverage is combined sewer systems that were built before 1980. consequently, large quantities of organic pollutants are discharged from the rainwater outlets into rivers during heavy rainfalls. the organic pollutants accumulate in downstream brackish-water regions, and water quality problems such as floating scum, foul odors, and cloudy water arise as a result of chemical changes associated with bottom water becoming anaerobic. in this study, the suspended solid (ss) runoff characteristics were investigated in the nomi river drainage basin in which a combined sewer system handles 100%. the overflow water depth and ss were measured at the weir in one rainwater outlet during two storm events, and the parameters for miKe urban software that calculates sewer runoff were adjusted in the ranges recommended by the manual so that the observation results could be reproduced well. next, the model was applied to the 38 outlets in the entire catchment of the nomi river, and the estimated discharges were input into a one-dimensional unsteady river flow model. observational results of water level and turbidity measurements within the river channel were satisfactorily reproduced by the calculation.

Field study on SS discharge from combined sewer system of highly urbanized area