Lakes of North America; A Reading Lesson for Students of Geography and Geology

Lakes of North America; A Reading Lesson for Students of Geography and Geology

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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. 1904 edition. Excerpt: ...and navigable channels, and also on account of the many harbor and canal improvements that have been made, a new survey of portions of these lakes has been found necessary, and is now in progress under the direction of Gen. O. M. Poe. The area of the Laurentian lakes has been determined with approximate accuracy from measurements made on the maps of the U. S. Lake Survey. The results of these measurements by different individuals vary somewhat, but those published by L. Y. Schermerhorn1 are here adopted. The volume of water flowing through the rivers draining the various lakes is on an average as follows: Cubic Feet Per Second. St. Mary's river, the outlet of Lake Superior...... 86,000 St. Clair river, the outlet of Lakes Huron and Michigan... 235.000 Niagara river, the outlet of Lake Erie....... 265,000 St. Lawrence river, the outlet of Lake Ontario..... 300,000 1 "Physical Features of the Northern and Northwestern Lakes," Amer. Jour. Sci., 3d sec, vol. 33, 1887, pp. 278-284. The mean elevation of the surfaces of the Laurentian lakes above the sea, their maximum depth, etc., as shown by soundings, are as follows: Mean Elevation And Maximum Depth, Etc., Of The Laurentian Lakes. The average discharge of the lakes is stated by Schermerhorn to be double that of the Ohio and nearly equal to one half the discharge of the Mississippi. The area of the Laurentian basin is a third larger than the hydrographic basin of the Ohio, or about a fifth of the combined areas of the basins of the Mississippi and its affluents. The outflow of the St. Lawrence basin is slightly less than half its rainfall, while on the Mississippi and Ohio the discharge is about a fourth of the rainfall. If the average discharge of the Laurentian lakes passed...show more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236783255
  • 9781236783257