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. 1907 Excerpt: ... spurs upstream, placed in order to train the current straight on to the weir. The necessity of this would be largely obviated if collapsible crest shutters were used. The weir with its apron could then be reduced 3 feet in height, with great advantage in the cost of construction. These shutters are not inserted in the ...
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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. 1907 Excerpt: ... spurs upstream, placed in order to train the current straight on to the weir. The necessity of this would be largely obviated if collapsible crest shutters were used. The weir with its apron could then be reduced 3 feet in height, with great advantage in the cost of construction. These shutters are not inserted in the alternative designs of Figs. 6b and 6c, the object being to exhibit variations in the design of the weir section under similar conditions. (59) Figs. 7 and 7a are of the Jobra Weir over the Mahanadi Rier in Orissa, Bengal. The section is of type A, of the common pattern, with the exception that two lines of curtain blocks are used. The analysis for frictional stability of the anicut, excluding the curtain, is as follows, rear slope taken as stanch: --Total.. 1,477-r-75 = 197 feet. Thus we see that the lines of curtain wells are not required for frictional stability, nor are they necessary for dynamical requirements. Fig. 7b is a design for the same work in type C. The value of Ap up to toe of the weir wall is 380, which divided by 75 the quotient is 507. With a head of 10 feet (tail water to floor level) the balance head here will be 543 feet. This is met by 4J X 1J = 56 feet downward pressure. The masonry floor further reduces this balance by 144 X 1 = 180 24 feet, leaving 3 feet to be neutralised by the talus, the required length of which will be X = 63 feet. 4i X 8 In the drawing another 37 feet has been added for hydrodynamical considerations (vide post). (60) The section of the Dehri Weir over the Son River in Bengal (Fig. 8) is remarkable as being that of the longest weir in existence, its length being nearly 2& miles. The crest is 8 feet above normal bed level, and the shutters are 2% feet high only. The statical head is therefore 1..
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