Headwall Selector |  Modifications and Accessories Over the years we have been asked to alter our standard Headwalls to suit specific requirements. We will always try to accommodate your requirements and detail below some of the modifications and accessories available. All of the accessories listed below can be supplied separately if required. If you can't see what you're after please call our Sales Office on 01603 488700 Sometimes you will need to have two pipes entering the watercourse at very nearly the same point, there may not be enough room to accommodate two headwalls....read more Weir walls can be built across the apron to raise the water level, divert the water, control its flow or measure the flow.......read more The toe of the headwall prevents scour undermining the structure, our standard toe is 200mm below the underside of the splashplate, we can now cast on an extended toe giving a depth of 600mm from the underside of the splashplate.... read more In order to meet the profile of the embankment or the proximity of the drainage outlet to the watercourse it may be necessary to provide an extended spillway in order to prevent erosion.....read more One of the main purposes of the Headwall structure is to dissipate the flow ensuring that it doesn't disturb the watercourse its entering causing erosion. In some cases the velocity of the flow will be excessive and will need to be slowed before it enters the watercourse. One way of doing this is to place Diffuser/Baffle Blocks on the spillway to dissipate the flow before it reaches the watercourse.......read more Baffle/Dissipation Blocks Baffle/Dissipation blocks can be cast onto the apron to interrupt the flow and therefore dissipate energy. Dragons Teeth Dragons Teeth can be cast at the end of the apron; again this interrupts the flow and dissipates energy. Stilling Basin A Stilling Basin is a preferred option from a maintenance point of view but because it normally involves a longer structure land take considerations can preclude its use. Baffle Chamber Construction of a chamber directly behind the Headwall and installing a flow control device is a further option we can offer. In some locations the authorities want the structures to blend in with the local surroundings, to accommodate this we can cast in dovetail slots to the face of the backwall and Wingwalls and then any stone or brickwork can be tied in.....read more Headwalls are provided with gratings for one of two reasons, either to prevent persons entering the culvert or to provide a barrier against debris entering the pipe/culvert and causing a blockage. Three different configurations of standard grating are available and they can be manufactured in Mild Steel, fully welded and then galvanised or in Stainless Steel........read more Where the Headwall is situated on the banks of a tidal watercourse or as a sea outfall there is a chance of the water level rising above the pipe invert and flowing back along the pipe. In order to prevent this we can fit a Flap Valve. Sometimes referred to as a non-return or check valve, we can offer four different types.......read more A requirement at a headwall can be to vary the amount of water let through into or out of the watercourse or to stop it altogether. In order to do this we can fit a Penstock to the Headwall. Penstocks can be supplied manufactured from Ductile Iron, Stainless Steel, HDPE or Composite.......read more The facility to fit Stop Logs to our Headwalls is available. If you want to vary the level in a conduit or to stop flow for maintenance Stop Logs can be used. A channel is fitted to the inside of the Wingwalls to the required height and the Stop Logs slot into the channels......read more One of the most accurate ways of maintaining water levels between two bodies of water is through the use of a Tilting Weir. A Tilting Weir is a weir plate that can be tilted through 90 degrees to adjust water levels and this would likely be fitted in a concrete structure or within a chamber behind a Headwall. ....read more Where a Headwall is situated within the Highway Boundary or on a steep embankment Hand Rails should be fitted across the top and in some cases down the Wingwalls. We are able to supply our Headwalls either fitted with the Hand Rails or with fixings cast into the structure for you to fit your own......read more In some situations access to the Headwall can only be gained from above the structure, where this occurs we can fit access ladders and landing platforms to the Headwall ensuring safe access for maintenance ...read more Wildlife tunnels and Mammal runs The effect a culvert has on wildlife must be taken into consideration when constructing a new culvert or refurbishing an existing one. Mammal runs are required where the watercourse forms the natural passage from one side of the road to the other, or where a Badger run, for instance, is severed by a new road. ...read more
The above information has been gained from several sources including The Environment Agency (EA), The Scottish Environmental Protection Agency (SEPA) and The Highways Agency (HA). You should always refer to the Agency responsible for your structure for guidance.
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