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Hillingdon SuDS Design & Evaluation Guide

Overview 3.3

Overview 3.3 Consequences of piped drainage Piped drainage is designed to convey water away from developments as quickly as possible, and has become the default way to manage rainfall across the developed world. However, this is at a cost to the environment and developments themselves. The disadvantages of traditional piped drainage are now becoming clear: ■■ ■■ Quickly carrying rainwater away from where it falls can increase the risk of flooding elsewhere. Limited pipe and network capacity, as well as blockage, can cause local flooding as water cannot get into the system. ■■ ■ ■ ■■ ■■ Recharge of groundwater and aquifers is prevented, and the natural ‘baseflow’ of water through the ground to watercourses is lost. ‘Flashy’ flows from urban areas can cause erosion of watercourses. Trees and plants in urban areas are at greater risk from drought stress, due to lack of access to rainwater. Wildlife is often trapped and killed by conventional drainage structures. ■■ Pollution from roofs, roads and car parks is washed into the sewer when it rains, contaminating streams, rivers and the sea and killing wildlife. 11 Foul water misconnections to surface water pipes result in polluted waterways at Glenbrook, Enfield where sewage fungus is evident. Pollution from roads and car parks is often visible - fuels, oil, heavy metals, tyre dust and silt all get washed into drainage systems. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

Limited pipe capacity, as well as blockage, can cause local flooding Trees and plants are at risk of drought, due to lack of rainwater. Overview 12 ‘Flashy’ flows can cause erosion of watercourses Quick conveyance of rainwater from site can increase the risk of flooding elsewhere. Recharge of groundwater and aquifers is prevented, and ‘baseflows’ to watercourses are lost. Pollution can be washed into streams, rivers and the sea. Hydrocarbons and tyre crumb are examples. Conventional drainage results in high rates and increased amounts of runoff reaching streams and rivers. Pollution from urban surfaces is also washed into watercourses. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

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