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Our standard range of headwalls all have splayed wingwalls. The opening in the headwall will be cast to suit the outside diameter of the specified pipe material and diameter Choose the material of the pipework you will be using with the headwall.

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Flap valves prevent water backing slot drainage uk the discharging pipework during storm events and periods of flooding If you require a grating as well please select a Cranked Grating Select if you would like an appropriately sized penstock fitted on your headwall.

Headwalls within a specific range often have a variety of backwall heights available. We cast the openings in our precast headwalls to suit the specified pipe diameter and material and are also able to accommodate multiple pipe openings in our headwalls Maximum pipe size This refers to the largest single opening we are able to accommodate in any given headwall.

We are also able to accommodate multiple pipe openings in our headwalls. Single or multiple pipe openings We cast the openings in our precast headwalls to suit the specified pipe diameter and material and if required to a specified invert level.

We will cast the opening into our headwalls slightly larger than the outer diameter of the specified pipework to make installation on site as easy, fast and safe as possible. We are able to cast the invert slot drainage uk of the opening into the backwall of our precast headwalls to a specified level.

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Most precast headwalls and Sewers for Adoption compliant headwalls have splayed wingwalls. The diameter opening relates to the internal diameter of any given pipework. When requested we can set the invert level of the pipe opening wherever on the backwall of the headwall you require.

The opening in the headwall will be cast to suit the outside diameter of the specified pipe material and diameter Althon Sewers for Adoption precast headwalls should be used when a concrete headwall is part of a Section Agreement and the sewers are to be adopted once completed by the local Water Company.

These openings can be arranged anywhere on the backwall of the headwall. Penstocks slot drainage uk used to isolate the flow of water and manage water levels If you require a grating as well please select a Slot drainage uk Grating Backwall heights This is the overall height of the backwall of the headwall.

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If you wish to have a penstock or a flap valve fitted please select a Cranked Grating Sewers for Adoption Compliant headwalls for pipework over mm should be fitted with a SFA Type 1 Outfall Safety Grille Select if you would like an appropriately sized flap valve fitted on your headwall. Angled precast headwalls allow slot drainage uk entering a watercourse at an angle to be accommodated or for an outfall to be situated on a bend in a river Select the internal diameter of the pipework being used with your headwall.

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Althon rectangular headwalls are also Sewers for Adoption compliant and are available with wall profiles to suit bank gradients of 1: Backwall height should be a consideration when considering cover to invert levels or the profile of the surrounding area or slope of the bank. Where required we are also able to cast openings for pipework through the wingwalls side walls of our precast headwalls Specifiable pipe invert levels Typically we cast the pipe openings in our standard precast headwalls at a — mm invert level up from the spillway of the headwall.

Sewers for Adoption compliant precast headwalls should have the invert level of the pipe opening set mm above the spillway.

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