Minutes of proceedings of the Institution of Civil Engineers Volume 99, pt. 1
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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. 1890 Excerpt: ...between the source and the service reservoir is 430 feet; of this 366 feet are exhausted in various falls and the remaining 64 feet in the gradients, which are--1--, r--and--?--, the average being--L--The dimensions of 1.000' 2.000' 4.000' 1.370 the section of the aqueduct are: a constant depth of 2 feet ll? inches, with widths of 2 feet 8? inches, 3 feet 4? inches, and 4 feet 0 inch, according to the gradient; the depths at the springing are: 4 feet 7 inches, 4 feet 9 inches, and 4 feet 10 inches, and the whole wetted perimeter is rendered with cement. According to Darcy's formula, the daily discharges for these sections should be 25,052,000 gallons, 21,893,000 gallons, and 20,424,000 gallons respectively; the actual unrestricted discharge is said to be 25,340,000 gallons, or 1 to 19 per cent. in excess, which must be due to the increase of velocity at the falls. It is proposed to utilize the power at present going to waste at the falls, amounting to 1,550 HP., to raise water for the supply of many small places above the level of the aqueduct at present unprovided. There are a few bridges, but most of the streams are crossed by iron siphons. There are several settling ponds at different points 100 feet long, 30 feet wide, and 12 feet deep, provided with two weirs, over the second of which is placed a wire-gauze screen to intercept floating matter; they have also grooves for the admission of stop-planks, by which the water can be turned into the Aniene for cleansing and repairs. The walls of the aqueduct in the trench are 16 inches, and on bridges and exposed positions 19? inches thick. There is a length of 7? miles in ordinary excavation, and an equal length in tunnel. The bridges, of which there are nineteen, retaining walls, &...
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