1. Section; Inland Navigation. Reports

1. Section; Inland Navigation. Reports

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...of the main water-courses. It is conceivable that after each abnormal rainfall, after thunderstorms or rapid thaws, large volumes of water will accumulate within very short spaces of time in the rivers and cause the often so lamentable high floods, because we have supplied so many artificial canals for the water in the drains which, though small and in themselves insignificant, are powerfull by their enormous numbers. It must no bo overlooked, moreover, that the deposition of the suspended matter, which is carried down by the water, must result in a gradual, slow, but continuous raising of the valley levels and of the rivers beds, which again means a rise in the high water level of the floods. And this will Anally have the consequence that the dangerous floods will threaten areas, situated at higher levels which had so far been spared those ravages. Under the former condition of affairs, on the other side, the precipitations were forced to remain on the ground for longer periods. The formation of high water was retarded, it is true, but the infiltration of the water into the soil was also facilitated, and the underground water and the springs were replenished at a more copious rate. The ever extending and manifold utilisation of water-courses for irrigation, for industrial purposes, and for navigation also tend to lower the water-level of the smaller rivers. Thus the advances of cultivation threaten to deteriorate the regime of the rivers, and it will becomes more and more difficult for the coming generations to check to and utilise the waters in their interest. Wolfschutz. INVESTIGATION OF THE METHODS BEST SUITED FOR Surmounting great Differences of Level BETWEEN THE REACHES OF CANALS ON THE SYSTEMS BEST SUITED Surmounting great Differences of...show more

Product details

  • Paperback | 204 pages
  • 189 x 246 x 11mm | 372g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236541359
  • 9781236541352