water wells
water features
water springs
wells (groundwater)
natural springs
pollution
geomorphology
geological phenomena
Groundwater is underground water found in the pore spaces and cracks of soil, sand, and rock. The source of all groundwater is precipitation, either through direct percolation into the earth's surface, or through replenishment from local surface water including lakes, ponds, wetlands or rivers. [Source: Encyclopedia of Environment and Society; Groundwater]
groundwater
concepts