Component: Vortex flow control

SuDS vortex flow control advice


A self-activating device that provides improved hydraulic performance over conventional flow controls such as orifice plates and throttle pipes and reduced maintenance requirements.


It consists of an intake, a volute and an outlet. Flow is directed tangentially into the volute to form a vortex. High peripheral velocities induce an air-filled core with resulting back pressure that reduces the rate of discharge of the flow.


Advantages and disadvantages



  • Larger opening than orifice plates or throttle pipes.

  • No moving parts

  • Individually sized for precise flow control

  • Range of fitting types / options for retrofit

  • Reduces upstream storage requirements

  • Adjustable versions available to provide future-proofing

  • Reduces risk of blockage

  • Minimal maintenance requirements

  • More expensive than orifice plates or throttle pipes

  • May require confined space entry if removal or replacement is required



Where component can be used?

Residential:  Yes

Commercial/industrial:  Yes

High density:  Yes

Retrofit:  Yes

Contaminated sites:  Yes

Sites above vulnerable groundwater: Yes



Peak flow reduction:  Good

Volume reduction:  Good

Water quality treatment: Low

Amenity potential:  Low

Ecology potential:  Low



  • Litter/trash removal

  • Chamber/sump cleaning

  • Visual inspection


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