ABSTRACT
Flow controls can be used to limit the inflow to, or outflow from, elements in an urban drainage system. Typical uses include restricting the continuation flow at a CSO to the intended setting (Chapter 12), and controlling water level in tanks to ensure that the storage volume is fully exploited (Chapters 12 and 20). Flow controls can also be used to limit the rate at which stormwater actually enters the sewer system in the first place, deliberately backing up water in planned areas like car parks to prevent more damaging floods downstream in a city centre (Chapter 20).
