ASDSO Dam Safety Toolbox

Plunge Basin Examples

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When the erosion anticipated downstream of the outlet works is minimal and/or manageable, a plunge basin (pool) is commonly used as the energy dissipator. Plunge basins may be lined or unlined. The discharge into the basin may come from a free outlet or from a valve. The following pictures are examples of plunge basins:

  • Unlined plunge basin (view is looking downstream). This basin has been allowed to scour over time.

    Unlined plunge basin (view is looking downstream). This basin has been allowed to scour over time.

  • A riprap-lined plunge basin.

    A riprap-lined plunge basin.

  • Concrete-lined plunge basin with baffle wall, grouted riprap side slopes, and discharge channel. Flow discharges into the plunge basin from two 36-inch diameter fixed-cone valve.

    Concrete-lined plunge basin with baffle wall, grouted riprap side slopes, and discharge channel. Flow discharges into the plunge basin from two 36-inch diameter fixed-cone valve.

  • Plan view of a typical lined plunge basin design.

    Plan view of a typical lined plunge basin design.

  • Elevation view of a typical lined plunge basin design.

    Elevation view of a typical lined plunge basin design.

  • Jet trajectory from a 54-inch diameter hooded fixed-cone valve.

    Jet trajectory from a 54-inch diameter hooded fixed-cone valve.

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