Osma slot drain. Channel drainage

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We are also able to accommodate multiple pipe openings in our headwalls. Backwall height should be a consideration when considering cover to invert levels or the profile of the surrounding area or slope of the bank.

BIM product files along with a variety of other support documents are all available for download here. Penstocks are used to isolate the flow of water and manage water levels If you require a grating as well please select a Cranked Grating Backwall heights This is the overall height of the backwall of the headwall.

Below Ground Systems

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. Typically these inlets either sit or are formed as part of a channel body that sits below the surface. However there is an important distinction to be made between some of them. Sewers for Adoption compliant precast headwalls should have the invert level of the pipe opening set mm above the spillway.

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When requested we can set the invert level of the pipe opening wherever on the backwall of the headwall you require. It is also used in areas subject to heavy loading where it is important to eliminate moveable parts Qmax is an example of this.

Where required we are also able to slot ostorero 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.

Because channels tends to be less deep than other systems it is particularly well suited when constructing drainage in areas with complex underground services and utilities. Headwalls within a specific range often have a variety of backwall heights available.

Our in house design team and our external design engineers have excellent technical understanding of interconnected systems that can help you create sustainable drainage solutions in is gambling bad for your health categories of the urban environment. We cast the openings in our precast headwalls osma slot drain suit the specified pipe osma slot drain and material and are also able to accommodate osma slot drain pipe openings in our headwalls Maximum pipe size This refers to the largest single opening we are able to accommodate in any given headwall.


For over 50 years we have been offering creative design solutions to all sectors of government, public and private enterprise and have a track record for development and regeneration informed by community aspirations and environmental context. This is significant as linear systems tend to offer economic benefits over point drainage as a result of reduced underground piping and easier construction that results from the elimination of complicated falls or levels.

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This can be utilised by designers for aesthetic benefit without the need to compromise on the drainage capacity. Angled precast headwalls allow pipework entering a watercourse at an angle to be accommodated or for an outfall to be situated on a bend osma slot drain a river Select the internal diameter of the pipework being used with your headwall.

In some cases they are also used for attenuation or containment of same. Most precast headwalls and Sewers for Adoption compliant headwalls have splayed wingwalls.


The channel is longer than it is wide with a cross sectional dimension design to contain the flow from the associated surface surrounding the installation. Flap valves prevent water gambling billings mt up 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.

As with channel systems the materials can vary from polymer concrete to plastic and steel. The osma slot drain 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.

ACO channel systems are used for external and internal applications, from Airports to Kitchens.

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