Categorisation of wetland type by hydrological features
Type	Wetland type	Code	Features
Headwater	Surface water depression	SW/D	No hydraulic connectivity with groundwater. Outlet has no direct connectivity with river system
	Surface water slope	SW/S	No hydraulic connectivity with groundwater. Outlet has direct connectivity with river system
	Groundwater depression	GW/D	Hydraulic connectivity (permanent or periodic) with groundwater. Outlet has no direct connectivity with river system
	Groundwater slope	GW/S	Hydraulic connectivity (permanent or periodic) with groundwater. Outlet has direct connectivity with river system
Floodplain	Floodplain	FP	Inputs are dominantly upstream river flows
	Unspecified or '?'		Wetland type, or one element of the type, cannot be specified

 

Wetland hydrological types and local terms
Type	Code	Local terms
Floodplain	FP	Sudd, river valley, swamp, floodplain, valley bog, marsh, cypress swamp, delta (inland), dambo, marsh, inland valley swamps and bolis, pantanal
Surface water depression	SW/D	Bog, prairie pothole, slough, kettle-hole, shallow depressions
Surface water slope	SW/S	Perched bog, peat, peat bog, pond, raised bog, blanket peat, muck, pocosin, saturated heath, palsa, aapa-mire, infilled lakes, constructed wetland
Groundwater depression	GW/D	Marsh, prairie pothole, fen, pond, bog
Groundwater slope	GW/S	Swamp, marsh, river valley, bog, dambo, fen bogs, peat bog, peat, wetland, pocosin, macrophytes, cypress domes, peat fen, pakahi, fen, mire, blanket bog, quaking fen, pond, domed bog and fen
General		Swamp, bog, marsh, 'basin storage', ponds, hydromorphic gleys, forest wetland