Design of Expansions for Sub-Critical Open Channel Flow

by C. D. Smith, Univ of Saskatchewan, Canada,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Expansions for open channel flow at sub-critical velocity are required whenever it is necessary to reduce the velocity of flow from a structure which discharges into an erodible channel. Typical examples are the outlet from a syphon or flume. The flow velocity in the structure upstream may be two, three or four times greater than the allowable velocity in the canal downstream. In these cases it is common to expand the flow in an outlet structure with diverging sidewalls, usually referred to as an outlet transition. This paper describes the research undertaken to determine the efficiency of straight-walled diverging transitions with various rates of expansion. The recommended design has an included angle between the sidewalls of 11.4 degrees.

Subject Headings: Fluid velocity | Open channel flow | Fluid flow | Subcritical flow | Water flow | Rivers and streams | Water discharge | Erosion

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