low water

According to John Scott Redd, Director, National Counterterrorism Center, the Terrorist Identities Datamart Environment, or TIDE, is the U.S. Government's central database on known or suspected international terrorists, and contains all source highly classified information provided by members of the Intelligence Community such as CIA, DIA, FBI, NSA, as well as many others. There are more than 300,000 records in TIDE, which represents over 200,000 unique identities when aliases and transliteration issues are taken into account. From the classified TIDE database, an unclassified extract is provided to the FBI's Terrorist Screening Center, which in turn is used to compile various watch lists such as the TSA's No-fly list, State Department's Consular Lookout and Support System, Homeland Security's Interagency Border Inspection System, and FBI's NCIC (National Crime Information Center) for state and local law enforcement. Redd represented this as a major step forward from the pre-September 11, 2001 status of multiple, disconnected, and incomplete watchlists throughout the government.
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Tides are the cyclic rising and falling of Earth's ocean surface caused by the tidal forces of the Moon and the Sun acting on the oceans. More generally, tidal phenomena can occur in any object that is subjected to a gravitational field that varies in time and space, such as the Earth's land masses or the Moon. (see Other tides).
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Noun
1. the lowest (farthest) ebb of the tide
(synonym) low tide
(hypernym) tide

Minimum height reached by a falling tide. The height may be due solely to the periodic tidal forces or it may have superimposed upon it the effects of meteorological conditions.