Dams and Weirs: An Analytical and Practical Treatise on Gravity Dams and Weirs; Arch and Buttress Dams; Submerged Weirs; and Barrages

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American Technical Society, 1916 - Dams - 206 pages
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Page 35 - The moment of the whole is equal to the sum of the moments of the parts. The area of the whole is 75+3333 = 3408.
Page 21 - ... base as follows: Here W is the area of the whole profile, equal, as we have seen, to 844 sq. ft. The area of the upper component (1) is 40 sq. ft. and of (2) 804. The lever arm of W is by hypothesis x, that of (1) is 2.5+.84 = 3.34 feet, that of (2) by formula (7) has already been shown to be 11.63 feet.
Page 151 - Description of Type. There is a certain type of drowned or submerged diversion weir which is built across wide rivers or streams whose beds are composed of sand of such depth that a solid foundation on clay is an impossibility. Consequently, the weir has to be founded on nothing better than the surface of the river bed, with perhaps a few lines of hollow curtain walls as an adjunct. Of this class of weir but one is believed to have been constructed in the United States, viz, the Laguna weir over...
Page 152 - A weir built on sand is exposed not only to the destructive influences of a large river in high flood which completely submerges it. but its foundation being sand, is liable to be undermined and worked out by the very small currents forced through the underlying sand by the pressure of the water held up in its rear. In spite of these apparent difficulties, it is quite practicable to design a work of such outline as will successfully resist all these disintegrating influences, and remain as solid...

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