Research Article
Jan 1946

Determination of Pressures within a Siphon Spillway

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Publication: Transactions of the American Society of Civil Engineers
Volume 111, Issue 1

Abstract

A correct determination of the internal pressures in closed conduits is an important factor in their design. In ordinary pipes with a straight alinement the computation of internal pressures is rather simple. It is limited to determination of the height of the piezometric line above the center line of the pipe after which a multiplication of this piezometer height by the unit weight of water gives the average value of the internal pressure within the pipe. This pressure is normally called “positive”-that is, inregard to the pressures exerted by air it is greater than the latter and their difference is positive. However, there are cases in which pressures become “negative,” or smaller than the pressure exerted by air. Such cases occur (a) in closed conduits when the verti cal alinement is above the piezometric line, (b) in conduits behind valves or gates; and (c) in siphons in which the effect of the curvature of the flow filaments is revealed by a distribution of internal pressures different from hydrostatic pressures. In the siphons the pressures may become either positive or negative. Expressions for the pressures within a siphon are derived in this paper.

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Go to Transactions of the American Society of Civil Engineers
Transactions of the American Society of Civil Engineers
Volume 111Issue 1January 1946
Pages: 679 - 688

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Published in print: Jan 1946
Published online: Feb 10, 2021

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I. M. Nelidov, M.ASCE
With U. S. Engr. Dept., Sacramento, Calif.

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