Chiltern Woods

Sudbury

Ardent was appointed to deliver an integrated SuDS strategy in support of an outline planning application for the allocated Chilton Mixed-Use Development North of Sudbury. The development proposals included 1080 residential units (CfSH 3/4), 22ha commercial use (B1, B2 & B8), a primary school, neighbourhood centre providing community and leisure facilities and circa 32ha community woodland.

Through early consultation with the Environment Agency, Anglian Water, Suffolk County Council and Babergh District Council, the SuDS strategy has been instrumental in informing the proposed development layout at the very earliest stage.  The integrated scheme is not only sustainable but seeks to alleviate downstream flooding issues within the town of Sudbury.  This has been achieved by reducing current greenfield runoff rates and accommodating the additional attenuation requirements on site, through careful and considered design approaches.

The surface water drainage strategy is characterised by the enhancement of existing field drainage ditches to terraced, landscaped flood meadows.   These areas will act as the primary online attenuation for storm events up to the 100 year + 30% allowance for climate change and conveyance of surface water.  They will also function as additional amenity space, capable of incorporating green public links, which can support both informal cycle-ways and public rights of way.  These enhanced channels will be integrated and fed by a site-wide strategic swale network, which itself will be interspersed with detention basins and localised terracing.  The residential areas will also showcase a spectrum of SuDS techniques including lined permeable paving, rain gardens, bio-retention tree pits and road side filter trenches; all positively draining to swales.  Commercial areas are to utilise extensive green roofs and large ephemeral wetland systems to both treat flows and further compliment the holistic approach exhibited across the site.

Modelling extract of the Integrated Swale Network using WinDes Microdrainage V12.6

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