Directive 2000/60/EC of the European Parliament and of the CouncilShow full title

1.2. Ecoregions and surface water body types U.K.

1.2.1. Rivers U.K.

System A

Fixed typology	Descriptors
Ecoregion	Ecoregions shown on map A in Annex XI
Type	Altitude typology high : > 800 m mid-altitude : 200 to 800 m lowland : < 200 m Size typology based on catchment area small : 10 to 100 km2 medium : > 100 to 1 000 km2 large : > 1 000 to 10 000 km2 very large : > 10 000 km2 Geology calcareous siliceous organic

System B

Alternative characterisation	Physical and chemical factors that determine the characteristics of the river or part of the river and hence the biological population structure and composition
Obligatory factors	altitude latitude longitude geology size
Optional factors	distance from river source energy of flow (function of flow and slope) mean water width mean water depth mean water slope form and shape of main river bed river discharge (flow) category valley shape transport of solids acid neutralising capacity mean substratum composition chloride air temperature range mean air temperature precipitation

1.2.2. Lakes U.K.

System A

Fixed typology	Descriptors
Ecoregion	Ecoregions shown on map A in Annex XI
Type	Altitude typology high : > 800 m mid-altitude : 200 to 800 m lowland : < 200 m Depth typology based on mean depth < 3 m 3 to 15 m > 15 m Size typology based on surface area 0,5 to 1 km2 1 to 10 km2 10 to 100 km2 > 100 km2 Geology calcareous siliceous organic

System B

Alternative characterisation	Physical and chemical factors that determine the characteristics of the lake and hence the biological population structure and composition
Obligatory factors	altitude latitude longitude depth geology size
Optional factors	mean water depth lake shape residence time mean air temperature air temperature range mixing characteristics (e.g. monomictic, dimictic, polymictic) acid neutralising capacity background nutrient status mean substratum composition water level fluctuation

1.2.3. Transitional Waters U.K.

System A

Fixed typology	Descriptors
Ecoregion	The following as identified on map B in Annex XI: Baltic Sea Barents Sea Norwegian Sea North Sea North Atlantic Ocean Mediterranean Sea
Type	Based on mean annual salinity < 0,5 ‰ : freshwater 0,5 to < 5 ‰ : oligohaline 5 to < 18 ‰ : mesohaline 18 to < 30 ‰ : polyhaline 30 to < 40 ‰ : euhaline Based on mean tidal range < 2 m : microtidal 2 to 4 m : mesotidal > 4 m : macrotidal

System B

Alternative characterisation	Physical and chemical factors that determine the characteristics of the transitional water and hence the biological population structure and composition
Obligatory factors	latitude longitude tidal range salinity
Optional factors	depth current velocity wave exposure residence time mean water temperature mixing characteristics turbidity mean substratum composition shape water temperature range

1.2.4. Coastal Waters U.K.

System A

Fixed typology	Descriptors
Ecoregion	The following as identified on map B in Annex XI: Baltic Sea Barents Sea Norwegian Sea North Sea North Atlantic Ocean Mediterranean Sea
Type	Based on mean annual salinity < 0,5 ‰ : freshwater 0,5 to < 5 ‰ : oligohaline 5 to < 18 ‰ : mesohaline 18 to < 30 ‰ : polyhaline 30 to < 40 ‰ : euhaline Based on mean depth shallow waters : < 30 m intermediate : (30 to 200 m) deep : > 200 m

System B

Alternative characterisation	Physical and chemical factors that determine the characteristics of the coastal water and hence the biological community structure and composition
Obligatory factors	latitude longitude tidal range salinity
Optional factors	current velocity wave exposure mean water temperature mixing characteristics turbidity retention time (of enclosed bays) mean substratum composition water temperature range