Appendix 1 - Term Definition

Term definitions
Term Definition
Catchment An extent or an area of land where all surface water from rain, melting snow or ice converges to a single point at a lower elevation
Culvert A covered channel or pipe designed to prevent the obstruction of a watercourse or drainage path by an artificial construction
Fluvial flooding Flooding resulting from water levels exceeding the bank level of a river or stream
Groundwater flooding Occurs when water levels in the ground rise above the naturalsurface. Low lying areas underlain by permeable strata (e.g. Chalk) are particularly susceptible
Main river All watercourses shown as such on the statutory main river maps held by the Environment Agency and the Department ofEnvironment, Food and Rural Affairs for which the Environment Agency has responsibilities and powers
Ordinary watercourses All watercourses that are not designated Main River, and which are the responsibility of local authorities or Internal Drainage Boards (IDBs)
Resilience measures Measures designed to reduce the impact of water that entersproperty and businesses; could include measures such as raising electrical appliances
Resistance measures Measures designed to keep flood water out of properties andbusinesses; could include flood guards for example
Surface water/runoff Rainwater (including snow and other precipitation) which is on the surface of the ground (whether or not it is moving), and has not entered a watercourse, drainage system or public sewer. The term 'surface water' is used generically to refer to water on the surface

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