Hillingdon SuDS Design & Evaluation Guide
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7.4.3 Collection of runoff from hard surfaces<br />
The way that runoff is collected from roofs, Surface collection in channels, gutters and<br />
roads, car parks and other hard surfaces is a permeable pavements, or as sheet flow onto<br />
critical consideration in any <strong>SuDS</strong> design. grass surfaces, keeps runoff at or near the<br />
surface, enabling cost-effective and visually<br />
Conventional drainage techniques such as<br />
legible design.<br />
gully pots and pipes, promote the<br />
concentration of flows and mobilisation of Collection of runoff at or near the surface<br />
pollutants, forcing runoff deep underground, also reduces maintenance costs, and allows<br />
so that management of runoff at or near the for simple removal of blockages.<br />
surface is difficult to achieve.<br />
Concept <strong>Design</strong><br />
Highway runoff is intercepted using a chute<br />
gully and taken into a conveyance swale at this<br />
retrofit <strong>SuDS</strong> project. Devonshire Hill, Haringey.<br />
32<br />
Permeable paving and planted open channels<br />
collect runoff from hard surfaces at Bewdley<br />
School, Worcestershire.<br />
London Borough of <strong>Hillingdon</strong> <strong>SuDS</strong> D & E <strong>Guide</strong><br />
© 2018 McCloy Consulting & Robert Bray Associates
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