An artesian well is a deep drilled well through which water is forced upward under pressure. The water in an artesian well flows from an aquifer, which is a layer of very porous rock or sediment, usually sandstone, capable of holding and transmitting large quantities of water. The geologic conditions necessary for an artesian well are an inclined aquifer sandwiched between impervious rock layers above and below that trap water in it. Water enters the exposed edge of the aquifer at a high elevation and percolates downward through interconnected pore spaces. The water held in these spaces is under pressure because of the weight of water in the portion of the aquifer above it. If a well is drilled from the land surface through the overlying impervious layer into the aquifer, this pressure will cause the water to rise in the well. In areas where the slope of the aquifer is great enough, pressure will drive the water above ground level in a spectacular, permanent fountain. Artesian springs can occur in similar fashion where faults or cracks in the overlying impervious layer allow water to flow upward. Water from an artesian well or spring is usually cold and free of organic contaminants, making it desirable for drinking. In North America, the Dakota sandstone provides aquifers for an artesian system that underlies parts of the Dakotas, Montana, Wyoming, Kansas, Nebraska, and Saskatchewan and supplies great quantities of water to the dry Great Plains region. Many East Coast cities derive their water supplies from aquifers that are exposed along the edge of the Piedmont and dip downward toward the Atlantic coast. The largest artesian system in the world underlies nearly all of E and S Australia. Other important artesian systems serve London, Paris, and E Algeria.
That was very ilustrative, Lily. I like the photo too!
Thank you Erwin :) It isn't often I've seen an artesian well. They are usually away from the road. Where I live water isn't difficult to find (the dugouts have enough water in them for the cattle).
BTW I have to ask you....Where/how did you learn to speak/write English so well? I noticed google has a translator but, for the couple of sentences I posted in Spanish, I don't think it really translated what I had to say very well.
Translators on line are a piece of trash, but sometimes helps (anyway, I don´t like to use them) I have learned some english by myself. A friend told me that some people believe that chilean use arrows and feathers (so funny), in the case they are noticed that Chile exists (even more funny) -I know you're not one of them-. Anyway... you are very kind and patient for reading me. Greetings from Chile.
I think it's wonderful that we can converse with people from around the world. The areas of Chile that you post look so similar to Saskatchewan (and we too often feel ignored ;)...low population here (within Canada) so our voice isn't often heard either.
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