Our Proposals
Water Management & Sustainability
Integrating blue and green infrastructure has been a key consideration from the outset.
Integrating blue and green infrastructure has been a key consideration from the outset, due to the East Clandon Stream running along the site's western boundary, the unnamed Ordinary Watercourse along the north and northwestern boundary, and the Papercourt Lake SSSI outside the site to the northwest.
The site is mainly Flood Zone 1 (Low risk) with some Zones 2 and 3 at the western edge. A site-specific Flood Risk Assessment is being prepared and will be incorporated into our water strategy to produce robust flood mitigation measures and increase biodiversity.
The proposed water approach retains and enhances existing water bodies such as areas of ponding and an existing surface water flow route to the east of the site.
Sustainable Urban Drainage Systems (SUDs)
SUDs mimic the natural drainage system, decreasing flood risk and improving water quality before discharge. The use of vegetation also creates new habitats, in-line with our BNG and SANG aims.
Key Outcome
Surface water discharge will be restricted to 'greenfield run-off' (the natural flow of rainwater from a site in its undeveloped natural state).
SUDs Features
Wetlands
Permanent water levels within green open space to provide attenuation and treatment of water.
Detention basins
Providing attenuation during heavy rainfall, but normally dry and functions as a recreational facility during dry periods. Gravel and vegetation provide water treatment prior to discharge.
Swales
Broad shallow permeable channels to convey and store run-off. Vegetation in the swale allows run-off to be treated and silt to be deposited.
Water butts
One of the most common measures for property-level SUDs, collecting rainwater.
Rain gardens
Shallow landscaped depression to collect rainwater from downpipe or from road and release slowly to ground or sewers to reduce the volume of run-off.
Lined permeable pavement
Would provide water quality benefits, while attenuating and slowing down water flows.