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Hillingdon SuDS Design & Evaluation Guide

Overview 3.0 The Impact

Overview 3.0 The Impact of Development For millennia, people have been making changes to our landscapes which affect the fate of the rain that falls on the land. In recent history, the scale of urbanisation and our attitudes toward rainwater have caused serious problems both for ourselves and for the natural environment. 3.1 A rural landscape becomes urban Before the universal use of piped drainage it was common to collect and convey runoff across the land surface directly into ditches, streams and local rivers. With the growth of Victorian cities and the development of piped drainage, human and industrial waste, together with rainwater runoff from buildings and streets, was directed into a single underground pipe called the combined sewer. In periods of heavy rainfall, combined sewer overflows act as a relief valve when flows exceed sewer capacity, discharging untreated foul sewage into local watercourses. Many British cities and towns of Victorian age are served by combined sewers. 9 The Combined Sewer. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

3.2 Separating rainwater from foul sewage In the mid-twentieth century it was realised Unfortunately, rainwater still gets into the that foul sewage and storm water should be foul sewer and misconnections separated. A separate sewer arrangement contaminate surface water sewers and was introduced with the foul sewer for receiving watercourses. The SuDS human waste and the surface water sewer approach to managing rainfall can for rainfall. However, in many urban areas minimise these misconnections by these connections are still unclear and are keeping runoff at or near the surface. complicated by highway drainage and other ad hoc arrangements. Overview 10 Separate pipes for foul sewage and surface water were introduced in the mid-twentieth century. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

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