Policy information sourced from the Hillingdon Local Plan: Part 1

OE8 Development Likely to Result in Increased Flood Risk Due to Additional Surface Water Run-Off – Requirement for Attenuation Measures

Planning permission will not be granted for new development or redevelopment of existing urban areas which would result in an increased flood risk due to additional surface water run-off, unless the proposed development includes appropriate attenuation measures to a standard satisfactory to the council, in consultation with the environment agency and, where appropriate, other drainage bodies.

For more information please see Appendix 5 of the Local Plan: Part 1