Sustainable Drainage For Highways Infrastructure

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Sustainable Drainage for highways infrastructure
Introduction
Construction of no porous highway surfaces and pavements areas have high possibility of modifying the hydrological cycle with larger volumes of runoff being conveyed over short periods of time at increased flow rates to nearby water courses. Highway drainage has been designed to rapidly remove surface runoff from the carriageway and discharge directly and positively into nearest watercourses. It is now recognised that runoff from highways contains range of pollutants which have negative impacts on watercourses such as vehicle derived exhaust emissions, fuel and lubricant losses tyre and car fabric losses . Ground paving in leading to flooding, water pollution and situation is likely to get worse as climate changes. Drainage need to be designed to keep to water on site longer and allow percolation as a result reducing pollution and flooding. If possible water should be stored and used. The existing drainage system on A45/A46 Tollbar junction is a combination of piped system, kerbs and gullies discharging to carrier pipes and surface water channels discharging into carrier pipes network. Runoff collected from the junction finally discharge into river Avon. The present drainage system has no special features to make it sustainable. The system does not have oil/petrol interceptors or any device for controlling pollution. There are no measures to deal with accidental spillage, which will discharge into river Avon.
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