Engineers and Engineering Volume 30

Engineers and Engineering Volume 30

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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: much as have we in the Western part of the State. A careful estimate of the direct loss due to the four floods in 1889, 1894, 1902 and 1904, amounts on the West Branch to $13,000,000, Williamsport and Lock Haven being the principal sufferers; on the North Branch to $1,800,000; and on the Main River above the state line to $700,000--a total for the basin of $16,500,000. You are, of course, familiar with the high water troubles in this section; and no doubt you recall the disastrous Passaic River floods of 1902 and 1903, causing a direct loss estimated at $10,000,000. Variation of Flow--In spite of all these enormous quantities of water going to waste and leaving death and destruction in their wake, one finds these same streams a few months away with insufficient water for any useful purpose. The comparative high and low water flows of certain streams in Pennsylvania are shown in Table I: TABLE I Comparative High And Low Flow Records Of Certain Streams In Pennsylvania Effects of Low Water--Navigation--The troubles due to these low stages are nearly as serious and costly, though not so spectacular, as those due to floods. The low water flow of the Monongahela River (160 cubic feet per second) is only about two-thirds of the quantity necessary to operate the present locks at their full capacity, even without making any allowance for losses by evaporation and leakage. Similarly, the Youghiogheny, the improvement of which, at an estimated cost of $1,000,000, has already been authorized, cannot supply enough water at extreme low stages to maintain pool-full navigation. Nor are all these difficulties in the future. With the exception of the Monongahela slack-water system, taken over and improved by the Government, all the old canals of more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • United States
  • English
  • black & white illustrations
  • 1236920678
  • 9781236920676