Artesian Water Wells
Artesian Wells. Deep wells are often made by artesian boring, which consists in forcing an iron tube of small diameter through the impervious strata to the porous strata below, as shown in picture 47. This was first done at Artois, in France, hence the name artesian. Water derived from this source is generally good owing to the depth from which it is drawn. It will be seen from this sketch that the impervious strata (1) extend above the level of the sinking, and consequently the water will be forced up the pipe to the height that is anywhere maintained in the porous strata. Borings in sandstone or limestone usually give large and constant supplies, while wells in shallow sand or gravel beds, and even chalk, often fail in dry seasons.
Picture 47. Artesian Well.
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