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Storm Attenuation Systems


Storm Attenuation Systems

The production of water impermeable surfaces in construction is inevitable. This includes roof areas on buildings, car parks, loading bays and road pavements. The provision of these surfaces interrupts the natural drainage process creating increased stormwater runoff in respect of both volume and flowrate. In many cases this increase in stormwater flow and volume is not a problem as the local sewer or watercourse has sufficient capacity to cope. However in many situations the local network is running full and the local watercourse would be adversely effected by any increase in flow or volume. These problems could be alleviated by an increase in the size of the stormwater sewer or watercourse, thus providing enough capacity within the drainage system to cope with the increase in surface water. This however may be expensive, cause major infrastructure disruption and may be completely unfeasible. The type of systems which can be employed to overcome these problems are well documented varied and in some cases very technical in their operation, maintenance and construction. The selection of a system will depend upon site constraints, position, nature of the problem and inevitably cost. storm water management systems can be designed to suit a wide range of construction projects and drainage schemes. Precast concrete attenuation components include products such as side entry manholes, stop end bends and spigot and socket end wall pipes. These products can either be engineered into an on-line sewer pipe system or utilised off-line as single or multiple storm water holding tanks. Precast storm attenuation products comply with the requirements set out within ‘Sewers for Adoption 7th Edition’ and are made from Kite marked precast concrete components which comply with the relevant Standards. Pipes BS EN 1916 & BS 5911-1 and Manholes BS EN 1917 & BS 5911-1.


1. Systems can be designed specifically to suit the application
2. Speedy construction using a standard joint
3. No need for fabrication on site or external specialist contractors
4. Striaght forward installation using known techniques - no need to retrain
5. Can be installed under roads and car parks
6. Can cope with construction plant loading
7. Flotation is not a concern - no need for geotechnical anchors when located below the water table