Impact Basin Examples

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Energy dissipation in an impact basin is accomplished through the turbulence created by the loss of momentum as flow entering the basin impacts a baffle, and the direction of the flow is changed. At high flow, further dissipation is produced as water builds up behind the baffle to form a highly turbulent backwater zone.

The type VI impact basin is a relatively small structure with highly efficient energy dissipation characteristics. This type of energy dissipation structure does not require tailwater control.

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  Type VI Impact Basin Structure (image courtesy www.precon.ca)

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  Type VI Impact Basin Structure (image courtesy www.precon.ca)

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  Construction of Type VI Impact Basin structure (image courtesy www.precon.ca)

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  Layout for a Type VI Impact Basin

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  Impact Basin with flow being discharged.

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  Type VI impact basins placed side by side.

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  The end of this outlet conduit was constructed too close to the vertical hanging baffle resulting in intense sprayback. Lesson learned - follow design guidance!

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  Hook Basin

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  Standard Baffle Basin

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  Basin utilizing staggered rows of baffles.

Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.
Revision ID: 4758
Revision Date: 12/02/2022