Dissipative or low-gradient beaches are expected to filter low volumes of seawater. This idea was tested on the Oregon coast on two high-energy dissipative beaches with medium and fine sand and found to be correct, filtered volumes being $0.1-7 m^3 m^-1 d^-1$. Input was mainly due to tidal effects as most wave energy was dissipated in the surf zone. During a very high-energy event on a high tide, however, filtered volume increased by an order of magnitude as a consequence of increased wave input.
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