Comments on the Design of an Urban Stormwater Drainage System

Mike Reda


Urban growth, accompanied by increased awareness of the environmental impacts of storm-water discharges, has led to new regulations for storm-water management requiring sophisticated analyses and mitigation measures. Urban drainage and stormwater management has evolved into a field that often requires highly sophisticated computer analysis. The purpose of this presentation is to show that even if a perfect design is made where no flooding occurs (no street water) at all at any rain-full intensity, there will be the problem of negative pressure and the venturi effect. This will create a vacuum in the piping system that can make for example a dog (at the inlet pit) feel that it is ejected from a jumbo jet flying 2 km above the ground.This effect occurs during and after the rain water is draining out from the storm water piping system.

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