Qmax High capacity slot drainage system

ACO Qmax has been developed to satisfy the demand for a versatile, high capacity slot drainage system for a wide range of applications involving small to large catchment areas to any load class. The system is specifically designed to form an integral part of any modern, sustainable surface water management solution requiring effective storage, attenuation and eliminating carry over in stormwater conditions.

Manufactured from Polyethylene (PE), including recycled material,  the lightweight material makes ACO Qmax easy to handle and quick to install yet extremely robust to withstand the rigours of typical construction site practices.

The 2m long channel units have simple push fit sealed connections as standard, with access being provided by a range of access chambers, step and channel connectors.

A choice of edge rail designs in ductile iron, composite or galvanised steel the ACO Qmax system can be tailored for use in each application, pavement design or aesthetic requirement. The ATec corrosion resistant coating on the ductile iron edge rails and PE body ensure ACO Qmax has a long service life in excess of 25 years. ACO’s new composite rail has been designed to eliminate the chance of corrosion, plus also delivering installation benefits with easy to use alignment joints between channels.

The unique patented inlet design of the channels provides a continuous pavement beam feature over the line of the channel, strengthening the pavement installation and eliminating the need for additional reinforcement in most applications.

The ACO Qmax range is CE marked and certified to BS EN 1433:2002 and can support all Load Classes up to and including F 900. 

ACO Qmax has received many accolades including Construction Product of the Year 2006 and The Queen’s Award for Enterprise: Innovation in 2006.

The ACO Qmax system is available in 150, 225, 350, 550, 700 and 900 sizes ensuring greater system flexibility for engineers and designers to optimize scheme hydraulics. Choice of three edge rail designs Q-Flow,Q-Guard and Q-Slot.

ACO Qmax channel edge rails are available in three different inlet slot designs. ACO Q-Flow with 25/26mm slots for an increased intake capacity, ACO Q-Guard with smaller heelguard slots, for pedestrian traffic and ACO Q-Slot for a discreet, unobtrusive finish.

There are three different material choices: high quality ATec coated ductile iron, hot dipped galvanised steel, or the new composite plastic edge rails.

New Qmax Q-Flow Composite rail

Qmax channels are now available with ACO’s new Q-Flow composite rail, suitable for a wide range of drainage applications with A 15 – F 900 load class.

  • Tough and durable composite construction
  • Accurate vertical and horizontal alignment
  • Will not rust / UV stable / flame resistant
  • Available in black and grey composite



  • Economical and efficient hydraulic designs can be achieved tailored to each application
  • Provides all necessary components to deliver conveyance, attenuation and source control for effective SUDS drainage schemes and designs
  • Channel sizes can be combined to form step fall systems reducing costs and optimising hydraulic designs
  • Eliminates storm water carry over
  • Specific installation details for each load class ensures total installed costs are minimised for every application
  • Resistant to industrial effluents, oils, petrol, diesel, road salts and de-icing agents
  • Improves on site handling & installation rates
  • Meets environmental construction targets
  • Provides unbroken pavement construction across the line of the channel, simplifying and strengthening the installation
  • Aesthetically pleasing finish - edge rails compatible with asphalt, concrete, block and natural stone pavements
  • Proven performance and durability


  • Provides all necessary components to deliver conveyance, attenuation and source control for effective SUDS drainage schemes and designs
  • Range of channel sizes can be combined to form step fall systems reducing costs and optimising hydraulic designs
  • Manufactured using recycled and recyclable materials.
  • Meets environmental construction targets
  • High-flow inlet and channel capacity
  • Suitable for all load classes A 15 to F 900
  • Excellent chemical resistance
  • Step connectors available for simple channel connection
  • One-piece channels supplied in 2m lengths
  • Available in six channel sizes 150, 225, 350, 550, 700 and 900
  • Full range of channels, access and outlet chambers, accessories and flow controls
  • Patented “Pavement beam” channel and inlet design
  • Choice of three edge rail designs Q-Flow,Q-Guard and Q-Slot
  • Push fit channel joints with integrated channel seals

Recommended Applications

  • Public landscaping
  • Car parking
  • HGV parking
  • Petrol station forecourts
  • Light industrial
  • Heavy industrial
  • Public Highways
  • Distribution yards
  • Airport (airside)
  • Port and dock side
  • Security areas
  • SuDs- Sustainable Drainage systems

Not Recommended Applications

  • Threshold drainage
  • Domestic landscaping

Related products


PDF Brochures

Installation DWG Files

Installation PDF Files

Qmax 150 DWG files

Qmax 225 DWG files

Qmax 350 DWG Files

Qmax 550 DWG Files

Qmax 700 DWG Files

Qmax 900 DWG Files

Qmax Access Chambers

Case Studies


BIM Models (IFC)

BIM Models (REVIT)

BIM Models (CIVILS 3D)

CPR Data


Cutty Sark
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Qmax Case Study: Omega Wolf