Which statement describes a Reversing Tidal Current?

• A. Flows in opposite directions with short slack water at reversal of each current
• B. Occurs when direction of flow RESTRICTED by barriers (i.e., river or strait)
• C. Only occurs in rivers
• D. Occurs when direction NOT restricted by barriers

Answer: (B)

Reversing tidal current happens when the tidal flow is confined by barriers such as a strait, river mouth, or narrow estuary. The restricted outlet traps the water in the basin and forces the current to switch direction as the tide changes. During flood, water moves through the channel in one direction; as the tide ebbs and the basin must drain, the flow reverses through the same passage, with a brief slack-water moment at the turning point. The key factor is the restriction by barriers, which creates the reversal.