A river before its entry into a town had a discharge of 200 litres per second and 30 mg/las the concentration of a conservative parameter. The town's waste water outfall having 250 mg/1 concentration of the same conservative parameter raised the river concentration to 75 mg/1 after complete mixing with the river water. The dilution ratio resulting from the discharge of the above said waste water at the outfall is

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.