More than you'd want to know about the Long Island, NY aquifers.
http://www.dec.ny.gov/lands/36183.html
It's easy to get water from wet sand -- basically, the water just dribbles out. Not so easy to get water from wet organic soil, because at best what dribbles out is full of assorted compounds -- hopefully natural compounds, but still not what you want when you're looking for a glass of clear water.
And then there's clay, which is the cousin of pottery, which water is mostly unable to pass through. For that matter, if you've ever tried to dig through clay, a shovel is unable to pass through.
My guess, as a professional electronics engineer, is that if there's a layer of clay underground, and then a layer of sand on top of the clay, then any rainwater will get trapped in the sand layer. The rainwater will pass through icky soil on the way to the sand, but the sand will tend to act like a water-filter as your well-pipe extracts water from the sand. At least it will be cleaner than trying to suck water out of the soil.
The process of groundwater erosion is chemical weathering
It is groundwater that is being eroded through a process.
Groundwater that is not otherwise fossil groundwater forms part of the "water table".
percolation
acidic groundwater
The process of groundwater erosion is chemical weathering
It is groundwater that is being eroded through a process.
Caves.
Groundwater that is not otherwise fossil groundwater forms part of the "water table".
Groundwater
percolation
acidic groundwater
An aquifer forms when groundwater pools between a permeable layer and an impermeable layer.
An aquifer forms when groundwater pools between a permeable layer and an impermeable layer.
Groundwater flowing into the ocean..
A Spring is a flow of groundwater that emerges naturally at the ground surface. A spring forms when an aquitard blocks downward movement of groundwater and forces it to move laterally.
It rains then that water forms a lake or river then the water soaks down into the ground Then it must stay there for a couple of years then it forms a large amount of clean water This cycle forms groundwater.