Policy FLD 3: Development and Surface Water (Pluvial) Flood Risk Outside Flood Plains

A Drainage Assessment will be required for all development proposals that exceed any of the following thresholds: • A residential development comprising of 10 or more dwelling units • A development site in excess of 1 hectare • A change of use involving new buildings and / or hardsurfacing exceeding 1000 square metres in area. A Drainage Assessment will also be required for any development proposal, except for minor development, where: • The proposed development is located in an area where there is evidence of a history of surface water flooding. • Surface water run-off from the development may adversely impact upon other development or features of importance to nature conservation, archaeology or the built heritage. Such development will be permitted where it is demonstrated through the Drainage Assessment that adequate measures will be put in place so as to effectively mitigate the flood risk to the proposed development and from the development elsewhere. Where a Drainage Assessment is not required but there is potential for surface water flooding as indicated by the surface water layer of the Strategic Flood Map, it is the developer's responsibility to assess the flood risk and drainage impact and to mitigate the risk to the development and any impacts beyond the site. Where the proposed development is also located within a fluvial or coastal flood plain, then Policy FLD 1 will take precedence.