Chart Navigation & Plotting · Tidal Currents — Slack and Strength
In a reversing tidal current, slack water is the moment when:
- AThe current is at zero velocity between flood and ebb✓ Correct
- BThe current is strongest
- CHigh water occurs
- DThe current sets due north
Explanation
Slack water is the brief period of zero current as the flow reverses between flood and ebb. Maximum flood and maximum ebb occur roughly midway between slacks; the timing does not necessarily coincide with high/low water.
Authority: NOAA Tidal Current Tables
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