SuDS in London - a guide
sustainable-urban-drainage-november-2016
sustainable-urban-drainage-november-2016
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5.20 Great Kneighton / Clay Farm, Cambridge<br />
Location<br />
Cambridge<br />
Extent<br />
£45m<br />
Cost<br />
109ha<br />
Date<br />
F<strong>in</strong>al phase: 2020<br />
Credits<br />
Cambridge City Council<br />
Countryside Properties<br />
Bovis<br />
Cala Homes<br />
Crest Nicholson<br />
Skanska<br />
Aecom<br />
PEP<br />
BBUK Studio<br />
James Blake Associates<br />
Environment Agency<br />
Hobson’s Conduit Trust<br />
<strong>SuDS</strong> components<br />
Soakaways<br />
Detention bas<strong>in</strong>s<br />
Bioretention bas<strong>in</strong>s<br />
Swales<br />
Rills<br />
Permeable pav<strong>in</strong>g<br />
Ra<strong>in</strong>water harvest<strong>in</strong>g<br />
Green/brown roofs<br />
Summary<br />
Holistic <strong>in</strong>tegration of water management<br />
<strong>in</strong>to major new development.<br />
Project description<br />
Great Kneighton, previously Clay Farm,<br />
is former green belt land 4km south<br />
of Cambridge. The site is typical for<br />
Cambridgeshire – flat, low-lay<strong>in</strong>g terra<strong>in</strong>,<br />
crossed with brooks and land dra<strong>in</strong>age<br />
channels. The mixed use development site<br />
of Great Kneighton suffered from poorly<br />
dra<strong>in</strong><strong>in</strong>g clay soils and a high water table,<br />
1m below ground. The site is with<strong>in</strong> the<br />
catchment of the historic Hobson’s Conduit,<br />
which dictated str<strong>in</strong>gent control measures<br />
for runoff from the development.<br />
Cambridge City Council, along with project<br />
partners, wished to <strong>in</strong>stall an <strong>in</strong>tegrated<br />
water management system with<strong>in</strong> a<br />
designated strategic open space that forms<br />
part of the Cambridge Green Corridor.<br />
Objectives<br />
• Control outflow <strong>in</strong>to Hobson’s<br />
Brook at 2l/s/ha<br />
• Install a <strong>SuDS</strong> code of conduct<br />
across the development site<br />
Permeable pav<strong>in</strong>g and tree plant<strong>in</strong>g<br />
• Withstand one <strong>in</strong> 100 year<br />
flood event, with 30% extra to<br />
allow for climate change<br />
• Provide amenity and ecological<br />
value to development<br />
Image courtesy of Simon Bunn<br />
115 5 Case studies