People who live in the city do not have to worry about wells or springs. The city supplies them with water. But out in the country and in some suburbs. Obtaining a water supply may be quite a problem. Such water may come from a spring or a well. A spring is a water that flows from a natural opening in the ground during the rainfall, part of the WELL? Water soaks into the soil and rocks through small spaces and cracks and is pulled down by gravity as far as the openings in the rocks will allow At different levels below the surface of the land there is a zone where all the openings in the rocks are completely filled with water.
This is called "the underground zone". The upper surface of it is called the water table". In valleys or other low places in the land surface, below the water tables. Springs occur where there are cracks in the rocks. In other words, the water that has been stored up there escapes as spring water. Some springs flow all year because they receive water from deep within the ground-water zone. Other springs flow only in the rainy season when the water table is at its highest level.
An artesian well is a well from which the water bubbles up naturally above the surface of the earth. An artesian well is formed when a layer of loose rock gravel or sand is sand between two layers of solid rock. The loose gravel or sand has spaces to hold the water. So we have three lavers-solid rocks above and below and a porous layer that is like a pipe between them. These three layers are not horizontal, they lie at an angle. Water enters the middle layer at the top end. Farther down, if an opening is made, there is a pressure that makes the water spurt out and we have an artesian well.