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The Construction of Mill Dams; Comprising Also the Building of Race and Reservoir Embankments and Head Gates, the Measurement of Streams, Gauging of Water Supply, &C

The Construction of Mill Dams; Comprising Also the Building of Race and Reservoir Embankments and Head Gates, the Measurement of Streams, Gauging of Water Supply, &C


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1874. Not illustrated. Excerpt: ... increase the discharge. The correction is made by adding to the actual depth obtained the amount of head water that would produce the velocity. Then from this measure can be ascertained by the table the actual amount of water spilling; except that from another cause of less consequence, but of sufficient importance to engage our notice, there is also a correction to be made, which is for the contraction to which short weirs are subject at the two ends. Weirs of all lengths, especially if narrower than the channel, are liable to this deviation or narrowing of the stream or flow of water--not, however, in so great a proportion as short ones. Experiments of a thoroughly reliable character show that this condition of the spill of water operates at both ends, and reduces the effective length of weir in about the proportion of twotenths of an inch for each inch in depth of the spill, or one inch for each five inches depth; that is, for a weir 80 inches wide and the spill 5 inches deep, the actual width to be calculated for will be 79 inches. It rarely occurs that such exactness will be required for the measurement, as is here described, and for all ordinary and practical purposes, the preceding instructions will be found sufficiently accurate. MEASUREMENT OF LARGE OPEN STREAMS. As in many cases it is impossible to construct even a temporary waste-board or weir, the quantity of water that the stream can supply must be obtained by first ascertaining the mean velocity in feet per minute, and also the area of cross section of the stream in square feet; when the product of these two quantities will give the required quantity of water afforded by the stream. The velocity of such stream can be estimated by throwing floating bodies on the surface of near the same specific gra...


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Product Details
  • ISBN-13: 9781150123870
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1150123877
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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The Construction of Mill Dams; Comprising Also the Building of Race and Reservoir Embankments and Head Gates, the Measurement of Streams, Gauging of Water Supply, &C
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