The AH4C Headwall is a two part Pcc Headwall that allows water to discharge at a 45 Deg. angle, the Environment Agency’s preferred method when discharging into a watercourse. The AH4C headwall fully meets the Environment Agency’s ‘Standard rules SR2015 No 27 – Constructing an outfall pipe of 300mm diameter through a headwall into a main river’ & Exempt flood risk activities: environmental permits section FRA12 ‘Outfall pipes less than 300mm diameter through a headwall’.
The AH4C is available with three different back wall heights and three different toe depths for Twin Wall or Clay Pipes up to & including 300mm ID. Having a separate toe makes it easier to handle and more importantly ensures the foundation around the toe and beneath the Headwall structure can be well compacted.