PPS 15 Planning and Flood Risk (Revised)·Page 24
Circumstances requiring consultation on flood risk
Developments must be assessed for flood risk consultation in various circumstances including location in areas with surface water flooding history, significant increase in run-off, impact on watercourses or flood defences, watercourse alteration, proximity to reservoir flood inundation areas, or increased flood risk to other developments.
• where a proposed development is located in an area where there is a known history of surface water flooding,
• where a proposal is of a size or nature that could significantly increase surface water run-off,
• where a proposal is likely to impact on a watercourse or existing or planned flood defences or other flood control structures,
• where a proposal (such as culverting) is likely to involve the alteration or diversion of a watercourse,
• where a proposal is located within a flood inundation area associated with a reservoir or other impounding structure,
• Where a proposed development is likely to increase the risk of flooding to other development or environmental assets (natural and built heritage).
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 15 - Planning and Flood Risk (Revised).pdf