Q-Brake Vortex

Controlling the release of stormwater

ACO Q-Brake Vortex is a horizontal vortex flow control designed to prevent downstream flooding by controlling the release of stormwater before it discharges into the watercourse or sewer. Available as a model in Microdrainage, Site3D and Causeway Flow Hydraulic Design software, it has many water authority approvals.

  • Custom built to suit the site requirements
  • Available from 2-100 l/s and up to 3m design head
  • Manufactured from grade 304 stainless steel
  • All parts welded to BS 4872
  • Available with curved or flat back
  • Attenuation volume required reduced
  • Larger clear opening, than traditional orifice plates, reduces risk of blockage

Parameters to quote

Each ACO Q-Brake Vortex and ACO Q-Chamber is individually configured to suit the specific performance criteria and the profile of the chamber.

  • ACO Q-Brake: design head (m) & flow rate (l/s)
  • ACO Q-Chamber: depth to invert / diameter of the chamber / number of pipe connections / diameters of pipe connections

NEW QuAD-VFC Design Tool

QuAD-VFC is a free cloud-based software that supports the design and specification of ACO’s Q-Brake and Q-Plate range. QuAD-VFC calculates vortex flow control dimensions to achieve required head and flow rates. Offering instant calculations, the tool helps to speed up specification by taking into account parameters such as chamber design and outlet dimensions.

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Q-Brake and Q-Chamber Datasheet
Q-Brake and Q-Chamber Datasheet

Find out more about the ACO Q-Brake Vortex flow Control and the new plastic chamber, ACO Q-Chamber, that can house it

ACO Q-Chamber

ACO Q-Chamber is a new durable bespoke prefabricated chamber designed to house ACO Q-Brake, as well as ACO Q-Plate. It combines easy-handling and simple installation with a fully-welded plastic, durable construction.

Key Benefits include:

  • Easy transportation and installation
  • Minimise working time in a confined space
  • All plastic interfaces fully welded, watertight and spark tested


  • Addresses planning and connection requirement of Floods and Water Management Act
  • Tailored performance provides optimum hydraulic efficiency
  • Reduces the need for on-site storage lowering installation costs
  • Available with a curved back for ease of installation
  • Simplifies access and maintenance
  • Removes the need for direct man access to sewer manholes
  • Proven performance and reliability
  • Approved by Severn Trent, Anglian and Scottish Water, and others
  • Simple to install


  • Regulates stormwater flows from 2-100 l/s litres per second
  • Individually configured
  • Self-activating system
  • Larger clear opening, reduces risk of blockages
  • Remote access for emergency drain down
  • Remote access bypass door
  • Inlet/outlet determined by laboratory verified curves
  • Flexible fitting options to suit profile of manhole chamber

Recommended Applications

  • Public Highways
  • Public landscaping
  • Car parking
  • HGV parking
  • Petrol station forecourts
  • Light industrial
  • Heavy industrial
  • Distribution yards
  • Airports (airside)
  • Port and dock sides
  • Security areas
  • SuDs

Not Recommended Applications

  • Threshold drainage
  • Domestic landscaping

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