SuDS Swale Inlet
Introduction to the system

The ACO SuDS Swale Inlet unit provides an aesthetically pleasing solution when linking proprietary conveyance drainage systems to vegetated infiltration features such as swales, basins, ponds and water courses.

In comparison to traditional in-situ structures and concrete headwalls, the low profile unit provides a natural looking interface between proprietary and vegetated drainage solutions, complementing the surrounding environment.image

The consistent product appearance makes the product ideal for phased or retrofit installation, and the 1 in 3 gradient profile can be used to help construct swales to satisfy the CIRIA C697 guidance (Design Criteria for Swales).

The surface finish and the flared outlet of the unit encourages water dispersion and reduces excessive flow velocities – helping to protect the surrounding environment from erosion and meeting the flow rate guidance in CIRIA C697. The ACO SuDS Swale Inlet will reduce the velocity and distribute the flow across a footprint up to 6 times that of a traditionally constructed pipe outfall.

As part of a system to manage the flow rate and volume of surface water run-off, the ACO SuDS Swale Inlet reduces the risk of localised flooding and eases pressure on the drainage network.

The ACO SuDS Swale Inlet can be integrated into any SuDS drainage scheme where there is a requirement to manage water on or near the surface, helping to manage surface water at its source.

The one piece unit is placed into position and can be installed using concrete bedding or, alternatively secured with spiral ground anchors. No additional on-site shuttering or formwork is required, removing the need to return to site and ensuring the final stages of a project can be concluded quickly and without hassle.

ACO SuDS Swale Inlet is manufactured from Vienite, ACO's high strength sustainable material which offers greater durability when compared to traditional materials and structure which can deteriorate in service. Vienite allows virtually no water absorptions providing protection against frost and freeze-thaw, thus maintaining the long term performance of the unit.

ACO SuDS Swale is available in 3 colour options: natural, grey and black. An optional textured finished can also applied along with a stainless steel grating for greater protection.

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  • 1 in 3 profile design satisfies CIRIA C697 and can be used for construction of swales
  • Can reduce the erosion rate to a quarter of that of a standard pipe (CIRIA R116)
  • Distributes the flow of water to 6 times the area of a standard pipe
  • Surface finish reduces flow velocities
  • Flared outlet aids alignment and water dispersion
  • Low profile design allows maintenance equipment to safely pass over unit
  • Flat base for level installation
  • Inlet connection: Ø160mm singlewall or Ø150mm twinwall pipe
  • Made from sustainable, robust, thermally stable materials
  • Fixing points for ground anchors or concrete haunching
  • One piece design


  • Aesthetically pleasing interface between proprietary and vegetated drainage features
  • Consistent appearance complements surrounding environment
  • Helps protect local area from erosion
  • Reduces excessive velocities and encourages water dispersion
  • Reduces the risk of localised flooding and pressure on the drainage network
  • Complies with flow rate guidance in CIRIA C697
  • Cost effective alternative to traditional in-situ structures and pre cast concrete headwalls
  • Offers durable, long term performance
  • Simplifies installation and removes unnecessary costs
  • Straightforward inspection and maintenance

Recommended applications

  • Swales
  • Pond or basin
  • Bio-retention area
  • Rain gardens
  • Water courses
  • Ditches
  • Wetlands

Not recommended applications

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  • Vienite - Recycle material
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