Masters Theses


"In all hydraulic structures that hold back water, whether for the purpose of power, irrigation or flood control, all must have some means of dissipating the energy that is produced by the movement of the water from the pond or reservoir to the tailrace. The method of dissipation depends largely on downstream conditions, terrain and economics. The dissipator is to prevent scour and the undermining of the dam itself. The construction of any type dissipator should be the best one available for the least cost of construction. However, space limitations may dictate another type of dissipator. It has been recommended that model studies be conducted on all proposed dissipators to determine actual flow conditions.

This paper is a study of conditions concerning a free water jet, which impacts on the water contained in a cylindrical basin, and to investigate the effect of the jet on the basin. This type of dissipator would be especially useful when the space for construction is limited, or if the soil is especially susceptible to erosion, and where there is a variable tailwater. The Bureau of Reclamation has developed dissipators of this type that operate more efficiently than the hydraulic jump type. (Figure 1).

The purpose of this paper is to determine the amount of energy that this basin can dissipate, to locate any adverse pressures on the basin itself, and to study the best location of the jet nozzle in relation with the surface of the water in the basin.

Satisfactory dissipation of energy was obtained at maximum discharge with the nozzle submerged, but large pressures were exerted on the bottom of the basin. Wells or swells at the top of the basin were moderate. With the nozzle above the surface of the water, air was entrained in the water in the basin. The presence of air decreased the pressures on the sides and bottom of the basin, but added to the turbulence on the top. Further model studies should be made to determine how air can be injected into the conduit before water enters the nozzle"--Abstract, pages 2-3.


Gevecker, Vernon A. C., 1909-1992

Committee Member(s)

Schaefer, Rodney A., 1926-2002
Kerr, Richard H., 1907-1980
Muir, Clifford D.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


Missouri School of Mines and Metallurgy

Publication Date



44 pages

Note about bibliography

Includes bibliographical references (page 43).


© 1961 Graham Wayne Wood, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Energy dissipation -- Mathematical models
Stilling basins -- Testing

Thesis Number

T 1324

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