Surface water and soil water drainage

In considering surface water and soil water drainage, account should be taken of available information on the Department for Infrastructure (DfI) website, including the Flood Hazard & Flood Risk Maps for NI. A proposed extension should result in no increase in surface water run-off and any loss of permeable ground must be mitigated. The use of Sustainable Drainage Systems (SuDS) are surface water management devices to help reduce the run-off rate, help improve water quality and where possible support biodiversity. There are a wide variety of SuDS for different types of ground conditions, including for infiltration, attenuation and conveyance. It is expected that consideration is given to the use of SuDS measures to assist in minimising flood risk, and that any extension or alteration must also maintain access to existing drainage, with any new drainage being well integrated.