Definitions for slack water
This page provides all possible meanings and translations of the word slack water
slack, slack water(noun)
a stretch of water without current or movement
"suddenly they were in a slack and the water was motionless"
slack water, slack tide(noun)
the occurrence of relatively still water at the turn of the (low) tide
Slack water, which used to be known as 'The stand of the tide', is a short period in a body of tidal water either side of high water or low water essentially when the water is completely unstressed, and therefore with no rise or fall of the tide and no movement either way in the tidal stream, and which occurs before the direction of the tidal stream reverses. Slack water can be estimated using a tide table, a tidal atlas or the tidal diamond information on a nautical chart. Tide tables, which tabulate the time of high and low water, are generally only published for Standard Ports. To determine the time of slack water at less important locations, the time difference between the time of high water at the Standard Port and at that location also needs to be known. For scuba divers, the absence of a flow means that less effort is required to swim, and there is less likelihood of drifting away from a vessel or shore. Slack water can reduce underwater visibility, as there is no flow to remove debris such as sand or mud. In areas with potentially dangerous tides and currents, it is standard practice for divers to plan a dive at slack times. For any vessel, a favourable flow will improve the vessel's speed over the bottom for a given speed in the water. Difficult channels are also more safely navigated during slack water, as any flow may set a vessel out of a channel and into danger.
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