WAquifer
WGroundwater
WAlnarpsströmmen
WArsenic contamination of groundwater
WArtesian aquifer
WCapillary fringe
WCommunicating vessels
WGroundwater pollution
WGroundwater recharge
WGroundwater sapping
WGroundwater-related subsidence
WHydraulic head
WInfiltration (hydrology)
WNubian Sandstone Aquifer System
WPhreatic zone
WPlume (fluid dynamics)
WSeep (hydrology)
WWater pollution
WWater resource policy
WWater table