Schedule 25, Part 1, paragraph 3(1)

Subject to sub-paragraph (2), a “flood risk activity” means— erecting any structure (whether temporary or permanent) in, over or under a main river; the carrying out of any work of alteration or repair on any structure (whether temporary or permanent) in, over or under a main river if the work is likely to affect the flow of water in the main river or to affect any drainage work; erecting or altering any structure (whether temporary or permanent) designed to contain or divert the floodwaters of any part of a main river; any dredging, raising or taking of any sand, silt, ballast, clay, gravel or other materials from or off the bed or banks of a main river (or causing such materials to be dredged, raised or taken), including hydrodynamic dredging and desilting; any activity which is likely to divert the direction of the flow of water into or out of a main river or alter the level of water in a main river; any activity within 8 metres of a non-tidal main river (or within 8 metres of any flood defence structure or culvert on that river) or any activity within 16 metres of a tidal main river (or within 16 metres of any flood defence structure or culvert on that river) which is likely to— cause damage to or endanger the stability of the banks of that river or of any culvert, cause damage to any river control works, alter, reconstruct, discontinue or remove any river control works, divert or obstruct flood waters or affect the drainage of that river, or interfere with the regulator's access to or along that river; any activity (other than an allowed activity) on a flood plain that is— which is likely to divert or obstruct floodwaters, to damage any river control works or to affect drainage; more than 8 metres from a non-tidal main river or more than 16 metres from a tidal main river, or more than 8 metres from any flood defence structure or culvert on a non-tidal main river or more than 16 metres from any flood defence structure or culvert on a tidal main river, any activity within 16 metres of the base of a sea defence which is likely to— endanger the stability of, cause damage to or reduce the effectiveness of that sea defence, or interfere with the regulator's access to or along that sea defence; any activity within 8 metres of the base of a remote defence which is likely to— endanger the stability of, cause damage to or reduce the effectiveness of that defence, or interfere with the regulator's access to or along that defence; any quarrying or excavation within 16 metres of the base of a remote defence which is likely to cause damage to or endanger the stability of that defence; any quarrying or excavation within 16 metres of a main river or any flood defence structure or culvert on that river which is likely to cause damage to or endanger the stability of the banks of that river.

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Source: legislation.gov.uk · retrieved 2026-07-30