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Urban Drainage, -flood risk was reduced- rainfall in Dec 2013 and Jan 2014…
Urban Drainage
Enfield- North London
Had regular floods in 2006, 2007 and 2008
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The area is heavily urbanised, which has caused problems for drainage and water quality.
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The aims of the project included reducing the flood risk and impact of flooding on habitats and residential areas, as well as reducing surface runoff from roads and pollutants to improve water quality and provide more habitats for wildlife and new recreational areas for residents
The three SUDS implemented in Enfield were swals, rian planter and wetlands.
Rain planters have been installed in schools- these collect rainwater and mange the flow of water into drains, lowering flood risk. They also provide opportunities educate children about water management.
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Wetlands have been constructed to improve water quality. Reed beds were created near Salmons Brook to decrease surface runoff from roads and filter water before it enters.
Groups such as Defra and Thames Water, local residents and Local scholls- Thames 21 were involved in this project.
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Local schools- Thames 21 offered education sessions for local schools to increase engagement. In 2015, 1000 students were involved in litter picking ad wildlife monitoring.
Defra and Thames water are providing water. 2012- Defra granted £340,000 towards a project.
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Catchment Management is a way of managing rivers and improving drainage systems by looking at the whole river catchment, adn interactions between water and land. It aies to minimise issues such as flooding, rought, water pollution and erosion in sensitive areas and improve the river ecosystem.
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Surface runoff is high in urban areas due to the cover of impermeable surfaces, e.g. tarmac and concrete. Infiltration is therefore low and because precipitation is more intense in urban areas it increases surface runoff. Runoff is channelled through man-made pipes, which transport water to rivers and streams.
Low infiltration rates and high surface runoff means a short lag time and a high peak discharge, It means water is channelled to the river quickly.
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-flood risk was reduced- rainfall in Dec 2013 and Jan 2014 did not cause significant flooding. Duds reduced ammonia levels in Salmons Brook by 67% and nitrogen levels by 43%. The population of eels and dragonflies have increased.