Energy Dissipation in Small Canals

by A. J. Clemmens, USDA, Phoenix, AZ, USA,
J. A. Replogle, USDA, Phoenix, AZ, USA,
A. R. Dedrick, USDA, Phoenix, AZ, USA,

Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution


Two approaches are used for energy dissipation in channels. In the first, the water is allowed to drop, thereby converting potential energy to kinetic energy. This excess energy is then dissipated to heat energy by the turbulence of a hydraulic jump, by turbulent circulation behind the nappe of a free overfall, by turbulence created by obstructions to flow, by turbulence in a stagnant pool, or by a combination of these. The second approach is to dissipate energy in small amounts and limit the amount of kinetic energy that the water is allowed to accumulate. A number of techniques have been used by the authors to dissipate energy inexpensively in small canals, usually with devices that were retrofitted into existing canals. This paper describes the techniques that have been employed.

Subject Headings: Hydro power | Turbulence | Energy dissipation | Canals | Energy conversion | Kinetics | Fluid flow | Heat flow

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