Q-Plate Orifice Plates Regulate stormwater flow

ACO Q-Plate is designed to regulate stormwater flows in projects where a vortex flow control is not the most effective solution, or where flows are greater than 100l/s.

Each unit is tailored to the specific performance requirements of the application providing optimum hydraulic efficiency within the system.

Remote access to the system can be provided by the optional bypass door and the emergency drain facility - simplifying access and removing the need for direct man access to sewer manholes.

Manufactured from grade 304 stainless steel, the unit is available as a flat or curved radius to suit manhole diameter.

The Q-plate has no limitations on design flow. For smaller flows from 2-100l/s the Q-Brake is more suitable.


Each unit is tailored to the specific performance requirements of the application.


  • 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
  • Simple to install


  • Regulates stormwater flows greater than 100 l/s litres per second
  • Provides an alternative where flow controls are not suitable
  • Individually configured
  • Bypass door and remote access for emergency drain down (Bypass option only)
  • Pipe sealing gasket

Recommended Applications

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

Not Recommended Applications

  • Threshold drainage
  • Domestic landscaping

Related products


PDF Brochures

Installation DWG Files

Installation PDF Files



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