Engineering News-Record Volume 34

Engineering News-Record Volume 34

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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. 1895 edition. Excerpt: ...of slope, and since the maintenance of a high level in Lake Huron, when that of Lake Erie is falling, will increase this slope, the St. Clair discharge would be correspondingly increased, and thus tend to prevent any beneflcial results accruing from the regulating works. It would, therefore, appear that. in order to be able to secure any substantial beneiit from the regulating works at the foot of Lake Superior, the level of Lake Erie must flrst be regulated by a dam at the head of Niagara Blver. I-t is a well-known fact in hydraulics that where water flows over the crest of a dam or weir, any slight variation of the depth on the crest of such weir will very ma-terlally modify the volume of discharge passlng over. For instnace, if the top of such a weir is 2 ft. below the general level of the water surface of a regulated lake, and a rise of 3 ins. from a heavy rain should occur, the volume of discharge over the weir would be increased 20%; or, if such were the conditions on the proposed dam for rogul-ating the level of Lake Eric at a time when the discharge was 250,000 cu. ft. per second, corresponding to that of the present mean stage, the increase would be 50,000 cu. ft. per second, and since the increment for 1 ft. change of level at such stage is probably not far from 33.000 cu. ft. per second, the change of 3 ins. above the regulating dam would correspond to that of 1.5 ft. under the present conditions of the lake outlet. A sudden rise of 3 ins. under the existing conditions would not increase the outflow to exceed 10,000 cu. ft. per second, from which it is evident that a properly constructed regulating dam at the foot of the lake would greatly. increase the discharge of Niagara River for small rises of the lake level, and...
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Product details

  • Paperback | 980 pages
  • 189 x 246 x 49mm | 1,710g
  • United States
  • English
  • black & white illustrations
  • 1236938607
  • 9781236938602