Slack water—The period in the tide cycle when there is little or no current. Slack water occurs approximately halfway between maximum ebb and maximum flood and can last for 15 to 45 minutes. It is said that during this period bird life in and around estuaries becomes quiet.

How do you know when slack tide is?

The moment when the tide turns and changes direction, the current ceases and also changes direction. This moment of no current is called slack tide or slack current. You can have a high slack when the tide reaches its maximum height or a low slack when the tide reaches its lowest height.

How long does slack water last for?

The time of slack water, particularly in constricted waters, does not occur at high and low water, and in certain areas, such as Primera Angostura, the ebb may run for up to three hours after the water level has started to rise. Similarly, the flood may run for up to three hours after the water has started to fall.