Report of the Board of Engineers on Deep Waterways Between the Great Lakes and the Atlantic Tide Waters Volume 1; Dec. 7, 1900.-- (Paperback)

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. 1900 Excerpt: ...For a low-water discharge of the river the submergence below the weir will be 0.41', making the value C = 3.54. Assuming the length of the proposed fixed weir to be 2,900 feet, the discharge will be Q = 3.54x 2,900x (6.6)1= 175,000 cubic feet per second; and, since a complete control of the lake level for minimum outflow requires that it should never be less than the capacity of the weir, it would appear that the proposed dimensions of weir are reasonably correct. It has been shown that the mean velocity for maximum discharge through the regulating works will be 6.4 feet per second, which will require a theoretical velocity head of 0.64 foot to generate the current, and 0.43 foot to overcome friction and maintain flow, making a total fall of 1.07 feet from the lake to the site of regulating works, instead of 0.72 foot required under the present conditions. Omitting the loss of head requisite to maintain flow above the works, the submergence from backwater will be, approximately, 0.9h, making the coefficient for the weir C=2.30 and the discharge Q=-2.30x2,900x(6.6) = 113,400 cubic feet per second. The mean velocity of flow through the sluices will be 6.7 feet per second, which, multiplied by the total area of sluice cross section, gives a discharge of 159,500 cubic feet per second, and a total discharge past the regulating works of 272,900 cubic feet per second, an amount 1,900 cubic feet per second in excess of the average supply during the storage period for any year since 1865, except that for 1876. A year of maximum supply similar to that of 1876 can only occur after one or more years of excessive rainfall over the entire lake basin, and when such conditions are known to exist the level of the lake can be allowed to fall sufficiently after the close of n...