Althon Swale Inlet headwalls are made from fibre reinforced precast concrete and designed for open inlets up to 300mm. They allow surface water runoff to enter SUDS features like swales and ponds, or to act as an outlet or overflow. Units have a 1:3 (18°) profile to match surrounding ground and include side recesses for secure installation on slopes.

  • Fibre reinforced precast concrete headwalls for swale and pond inlets up to 300mm

  • 1:3 (18°) profile matches typical swale and pond slopes

  • Side recesses help key the unit into slopes and prevent movement

  • Optional stainless steel or galvanised bar or mesh gratings with anti-tamper fixings

  • Grating sits in an 8mm recess to protect against damage during maintenance

  • Factory fitting of inline non-return valves such as Wastop valves available

  • BIM data available for design integration

Applications

  • Swale inlets for surface water management

  • Pond inlets and outlets

  • Sustainable drainage systems (SUDS)

Dimensions

  • Backwall heights 377 - 890mm

  • Approx headwall weight 159 - 1465kg

  • Max pipe opening 150 - 300mm

  • 1:3 (18°) profile

Materials

Fibre reinforced precast concrete

Options and variations

  • Stainless steel or galvanised bar or mesh gratings

  • Inline non-return valves such as Wastop valves

Installation

  • Side recesses for keying into slopes

  • Grilles fixed with 4 anti-tamper bolts, bottom two removable for hinged access

Maintenance

  • Grating hinges for easy access

  • 8mm recess protects grating during mowing