A Modern Approach to the Design of Grassed Channels

by N. Kouwen, Univ of Waterloo, Canada,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage


The design of grassed channels can be based on modern fluid mechanics principles. The resistance to flow in a grassed channel is linked directly to the relative roughness of the flow through long-accepted boundary layer principles. The difference between flow over grass linings and linings composed of rigid materials such as rip rap or concrete lies in the tendency of the grass to deform under an imposed fluid shear. A simple board drop test or the length of the vegetation provides all that is needed to carry out the hydraulic design of a vegetative channel lining.

Subject Headings: Boundary layers | Hydraulic design | Flow resistance | Fluid flow | Channel flow | Water flow | Material tests | Friction

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