During normal tidal and river conditions the weir gates are raised on each falling tide to impound the river upstream. The gates are lowered again when the tidal range rises above the impounded control level for the river. A horn is sounded to warn boat users when the gates are about to rise. The gates can also be raised to quay level to act as a barrage for flood protection from exceptionally high tides, and to deal with pollution incidents. Boats are not permitted to cross the weir at these times.
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