Safety buffer planning for tide currents

• A. 5-10 minutes before and after slack water
• B. 20-30 minutes before and after slack water
• C. 60-90 minutes before and after slack water
• D. Slack water timing has no buffer

Answer: (B)

Planning a safety buffer around slack water recognizes that tidal currents don’t flip instantly at the exact moment of slack. Even when the flow is near still, the transition can bring unpredictable shifts due to wind, channel shape, and water depth. Giving yourself about 20–30 minutes before slack and 20–30 minutes after slack creates a practical margin to assess conditions, stage gear, and respond if currents are stronger than predicted or if delays occur. This window reduces the risk of being caught by a ramping current just after slack or trying to fight stronger flows as the tide moves away from the slack moment.

Shorter buffers, like 5–10 minutes, don’t provide enough time to adjust to changing conditions. A 60–90 minute buffer is usually more than needed and can hinder planning without adding real safety benefits. Saying there’s no buffer ignores the reality that currents can surprise you around slack.