Water-Supply Paper Volume 468-471

Water-Supply Paper Volume 468-471

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...that they are excellent channels of circulation and should yield abundant supplies of water. It is to be expected, however, that the waters derived from this formation will be rather hard. Unlike most dolomitic marbles Stockbridge dolomite has a very low porosity and carries but little water in pores. ARTESIAN CONDITIONS. The word " artesian" is derived from the name of the old French province of Artois, in which wells of this type first became widely known. Originally the term was applied only to wells from which water actually flowed, but now it is applied to wells in which the water rises by hydrostatic pressure above the point at which it enters the hole. The term is sometimes improperly used for any deep well of small diameter, regardless of whether the water is under pressure or not. The question whether an artesian well will flow or not depends as much on the altitude of the mouth of the well as it does on the pressure of the water. The. essential conditions for artesian waters are the existence of a bed of porous or fractured rock through which water may flow, having an elevated outcrop where water may soak into it, with relatively impervious strata above and below to prevent escape of water and loss of pressure, and a supply of water to the outcrop sufficient to fill the reservoir. In Connecticut these conditions may be fulfilled in two principal ways--where sandstones between shales or sandstones between trap sheets function as the pervious and impervious strata, or where a blanket of compact till forms the restraining layer over bedrock that is pervious by reason of a network of fissures. In general, the rocks Figl'ke 6.--Diagram showing conditions under which artesian waters may exist in the Triassic sedimentary...
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Product details

  • Paperback | 254 pages
  • 189 x 246 x 13mm | 458g
  • United States
  • English
  • black & white illustrations
  • 1236792394
  • 9781236792396