Definition
In a partially mixed or salt-wedge estuary, buoyant fresh water runs out near the surface while a saline wedge intrudes along the bottom on the flood, giving a two-layer flow that can set in opposite directions at different depths. After heavy rainfall the surface outflow may add a knot or more to the ebb and delay the start of the flood, which matters for deep-keeled yachts and for anchoring in the stream.
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