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Detailed Design
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Designers should provide the following:
■ the net increase in impermeable area
■ greenfield runoff rates are calculated
based on the area of the redevelopment
parcel and not the wider development
■ storage requirements for additional
impermeable area based on outflow
controlled to greenfield rates for the
Facing: The Islington, Ashby Grove Raingarden.
A raingarden for a single property with control development parcel.
tube and overflow that can manage the 1 in 100
year return period rainfall event.
The Royal Borough of Kensington & Chelsea SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
