Elementary Lessons in the Physics of Agriculture

Elementary Lessons in the Physics of Agriculture

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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. 1894 edition. Excerpt: ...are very few localities on the earth where water can not be found beneath the surface, but the distance varies between very wide limits. Then, too, there are many localities where water-bearing layers are separated by those which are impervious to water and in which none is found. On the great majority of farms in our state the water supply of wells is that which percolates into the soils of the immediate or closely immediate neighborhood from the local rains and snows. The level at which this water can be found is generally farthest from the surface on the highest ground, and nearest to it on the lowest ground, but the level of the water under the high ground is almost always hi (/her than that in the low ground; and when the farm borders on a lake, it by no means follows that wells must be sunk to the level of this lake in order to procure water. On the campus of the university there is a well where the surface of the ground is 88 feet above Lake Mendota about 1,250 feet distant, but the water in this well is some 52 feet higher than that of the lake. In Figs. 40 and 41 are shown, by means of lines of equal level, the relation which standing water in the ground holds to the surface above on the Experiment Station Farm and these serve to illustrate the kind of variations which occur in most localities where the surface of the ground is not level. It will be seen from these two plates that the water surface really has its hills and valleys like the land and in the same places but differing in relative height. 158. The Lowering of Water in Wells.--One reason why the level of water in the ground rises as you go further back from the lakes and other natural outlets, is because the friction of the water in flowing through the soil increases...show more

Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236751930
  • 9781236751935