Precast headwalls, wingwalls, spillways and other precast concrete pipe outfall structures help improve the flow of water into and out of connecting pipework and offer protection from erosion and scour caused by fast moving turbulent water. A headwall also prevents the surrounding bank from eroding and sloughing into any adjacent watercourse, for example; attenuation ponds, detention basins, rivers, ditches and swales.
Althon precast concrete headwalls are designed to BS EN 1992-1-1 (EC2) and manufactured to BS EN 15258 & BS EN 13369 standards. Althon have been manufacturing headwalls since 1981 and have the largest range available in the UK. This includes SFA headwalls that meet Sewers for Adoption 7th Edition guidelines, for drainage outfalls that are to be adopted by the local Water Authority and comply with the Water Industry Regulations 2011.
Many Water Authorities have their own guidelines for the adoption of headwalls and associated drainage. Althon have designed ranges to specifically meet these requirements. For example the Althon range of rectangular precast outfalls conforms to the Severn Trent Water specifications. Althon angled headwalls meet the Environment Agency’s ‘Standard rules SR2015 No 27’.
Althon precast headwalls can be factory fitted with a range of accessories such as flap valves, penstocks, Kee Klamp® handrails as well as a selection of gratings and ladders. We cast openings in our headwalls for pipework from DN100 to DN2100 to standard or specified invert levels.
Use the Althon Headwall Specification Tool to identify the most appropriate headwall, or get in touch, we will be happy to assist.
If you require any assistance or more information please contact us by phone on 01603 488700 or by email email@example.com