Slackwater definitions

Slackwater

Floodwater with little or no velocity. It is formed when water in creeks, streams, or rivers backs up into low terrain, creating a temporary ponding condition.
Found on http://www.americantrails.org/

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Slackwater

Minimum velocity of tidal current, sometimes abbreviated "slack".
Found on http://www.encyclo.co.uk/local/21453

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