Irrigation Canals and Other Irrigation Works: Including the Flow of Water in Irrigation Canals and Open and Closed Channels Generally, with Tables Simplifying and Facilitating the Application of the FormulŠ of Kutter D'Arcy and Bazin

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G. Spaulding & Company, printers, 1892 - Canals - 681 pages
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Page 288 - Government Engineers, Geologists and Surveyors, and the range of instruments, as made by them for River, Harbor, City, Bridge...
Page 19 - ... plaster in cement with one-third sand in good condition: also for iron, cement, and terra-cotta pipes, well joined and in best order.
Page 19 - ... ashlar and well-laid brickwork; ordinary metal; earthenware and stoneware pipe in good condition, but not new ; cement and terra-cotta pipe not well jointed nor in perfect order; plaster and planed wood in imperfect or inferior condition ; and, generally, the materials mentioned with n — .010, when in imperfect or inferior condition.
Page 240 - But if the material is retentive of water, like clay, a vertical layer of stones or coarse gravel, at least a foot thick, or a dry stone rubble wall, must be placed at the back of the retaining wall, between the earth and the masonry, to act aa a drain.
Page 42 - That, at a given inclination, surface currents are governed by depths alone, and are proportioned to the latter. " 2. That the current at the bottom of a river increases more rapidly than at the surface. " 3. That for the same surface current the bottom current will be greater with the greater depth. " 4. That the mean current is the actual arithmetic mean between that at the surface and that at the bottom.
Page 48 - Elements of Geology, states : The erosive power of water, or its power of overcoming cohesion, varies as the square of the velocity of the current. The transporting power of a current varies as the sixth power of the velocity. * * * If the velocity therefore be increased ten times, the transporting power is increased 1,000,000 times. A current running three feet per second, or about two miles per hour, will bear fragments of stone of the size of a hen's egg, or about three ounces weight.
Page 288 - Instruments, No. 9 Province Court, Boston, Mass. They aim to secure in their Instruments: Accuracy of division; Simplicity in manipulation; Lightness combined...
Page 20 - ... inch diameter; canals with beds and banks of very firm, regular gravel, carefully trimmed and rammed in defective places; rough rubble, with bed partially covered with silt and mud; rectangular wooden troughs, with battens on the inside two inches apart; trimmed earth in perfect order.
Page 51 - G inches to 9 inches diameter, a mean velocity of not less than 3 feet per second should be produced. Sewers from 12 to 24 inches diameter should have a velocity of not less than ┐^ feet per second, and in sewers of larger dimensions in no case should the velocity be less than 2 feet per second.
Page 41 - The least velocity, or that of the particles in contact with the bed, is almost as much less than the mean velocity as the greatest velocity is greater than the mean. Rankine also states that in ordinary cases the velocities may be taken as bearing to each other nearly the proportions of 3, 4 and 5. In very slow currents they are nearly as 2, 3 and 4. "The deductions of Dubuat are that the relation of the velocity of the surface to that of the bottom is greatest when the mean velocity is least ;...

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