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The addition of impermeable surfaces will lead to an increase in the quantity of surface water run-off, which can overload the drainage system/ downstream watercourse and lead to potential flooding .
Control Flow in Drop Structures
Dropping water, whether storm, waste or potable, from high levels into deep tunnels can cause costly erosion to the surrounding chamber and supporting structure. Traditional solutions require large expensive structures and can still be suseptible to damaging hydraulic forces.
Before society added so many roads, car parks and buildings, roughly 80 percent of the rain that fell in a natural catchment would typically soak into the ground where it would be filtered and cleansed before gradually recharging our aquifers.
Infiltration is a priority process for Sustainable Drainage Systems to ensure control of water as close as possible to the point of falling and mimic natural processes.
Stormwater run-off can convey pollution from a wide variety of sources. This pollution can be mobilised during storm conditions, adversely affecting water quality and wildlife habitat in receiving waters.