Congressional Edition Volume 6426

Congressional Edition Volume 6426

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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. 1913 edition. Excerpt: the low central parts of the valley, where water could be procured without fail by sinking shallow wells; but a few were located where shallow water was found on the upper parts of the slopes and in certain shallow-water areas among the mountains. (See p. 18.) The wide, monotonous expanses that lie between the central shallowwater belt and the high-level shallow-water tracts have remained the most thinly populated, the least developed, and the most unpromising parts of the valley. Where the stream deposits of the upper slopes are porous enough to allow free percolation, the flood waters that enter the ground sink rapidly. A well drilled in such an area remains dry until it reaches the water table of the main body of ground water, far below the surface. In some places near the mountains impervious bedrock lies only a short distance below the surface, and water is found in the2 porous deposits that rest on this rock. More commonly, however, shallow water is found where there is no indication of bedrock, and in several high-level shallow-water tracts a great thickness of valley fill has been demonstrated by drilling. In many wells shallow water is struck above a layer of valley fill that has been rendered nearly waterproof by. a firm calcareous cement. In most localities the relation of the high-level waters to the main body of ground water could not be ascertained, because few wells that extend to the main body are found far enough up the slopes. At a few points, however, in or near areas of high-level waters, deep wells havo been drilled, and these show that ordinary unsaturated valley fill may occur below the cemented floor that holds up the shallow water and that the deep water to which they extend is not under much pressure, more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236774817
  • 9781236774811