ASDSO Dam Safety Toolbox

Plunge Pools

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Plunge pools are energy dissipating devices located below the outlet of a spillway. Energy is dissipated as the discharge falls into the plunge pool as a free-flowing jet. Plunge pools are commonly lined with rock riprap or other material to prevent excessive erosion of the pool area. Discharge from the plunge pool should be at the natural streambed elevation. Typical problems may include movement of the riprap, loss of fines from the bedding material, and scour beyond the riprap and lining. If scour beneath the outlet conduit develops, the conduit will be left unsupported and separation of the conduit joints and undermining may occur. [1]


See examples of energy dissipation using plunge pools


Revision ID: 4807
Revision Date: 12/02/2022