Research Article
Jun 1977
Proportional Weirs as Velocity Controlling Devices
Publication: Journal of the Hydraulics Division
Volume 103, Issue 6
Abstract
Of the many factors that govern the settling phenomenon, the flow velocity in the settling tanks can be controlled favorably by fixing suitably designed weirs at the outlets of the tanks. The velocity at the bottom should not dislodge the particles that have already settled. These requirements might be met with by velocities which are controlled to be constant with respect to the depth of flow, or velocities which reduce linearly with increasing depth or velocities that vary inversely with the depth. To achieve these types of velocity control, new proportional weirs have been designed. Very near to the outlet of the tank, over a small length, the flow was found to be turbulent and noncompliant with the expected type of velocity control. This small length of the disturbance may be provided over and above the theoretical settling length of the tank, for efficient sedimentation.
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Published In
Journal of the Hydraulics Division
Volume 103 • Issue 6 • June 1977
Pages: 633 - 648
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Jun 1977
Published online: Feb 3, 2021
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Nagar Seshagiri Rao Lakshmana Rao
Prof., Civ. Engrg. Dept., Indian Inst. of Sci., Bangalore, India
Duraiswamy Chandrasekaran
Asst. Prof., Soil and Water Conservation Engrg. Dept., Coimbatore, India
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