Mapping to show the suitability of the subsurface for infiltration SuDS

What is sustainable drainage? Sustainable drainage systems (SuDS) provide an alternative drainage solution to piped drainage networks. They aim to: (a) reduce damage from flooding; (b) improve surface water quality, and (c) protect and improve the environment. SuDS encompass a wide range of techniques that mimic natural processes, such as enhancing interception of rainwater by vegetation, allowing water to collect in ponds, filtering surface water through swales and wetlands and by encouraging water to infiltrate to the ground. The Floods and Water Management Act 2010 requires that new developments, over the size of a single dwelling, should use sustainable drainage to discharge surface water where possible. The National Standards for Sustainable Drainage (draft) states a hierarchy to guide which SuDS systems should be installed; this gives precedence to SuDS which infiltrate to the ground.