Flood Risk and Surface Water Drainage

Low Flood Risk

  • The entire site is at low risk of river and sea flooding.
  • The majority of the site is also at low risk from surface water flooding.
  • The risk of flooding will not increase as a result of the new development and instead, measures will be implemented as part of the surface w drainage strategy to minimise the risk and improve the current situation.
  • The risk of groundwater flooding has been assessed as low to moderate and long term groundwater monitoring is currently being undertaken.
  • The risk of sewer and reservoir flooding is considered low.

Surface Water Drainage

  • The site levels fall in all directions with the highest point located mid-way along the western boundary of the site, adjacent to Kennington Road. Levels then fall towards the lowest points in the south-east and north-east corners.
  • The proposed surface water drainage scheme will be designed to mimic the existing situation, allowing surface water runoff generated from the development to be slowly released into the existing ditches along the northern and southern boundary.
  • Sustainable Drainage Systems (SuDS) will be implemented to significantly reduce the rates that surface water runoff leaves the site.
  • SuDS, such as ponds, basins and swales, will not only control overland flows and reduce flood risk to existing and proposed properties, but also enhance the local environment for wildlife and offer additional benefits for local residents.
  • The use of ponds and basins will also provide water quality improvements by reducing sediment and contaminants through settlement and biological breakdown of pollutants.

Example of potential SuDS features

Photo 12 (Swale with Erosion Control).jpg
Photo 7 (Reed Bed).jpg
Photo 7 (Reed Bed).jpg
Photo 9 (Pond).jpg