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The band of water outside or beyond the territorial sea in which a coastal nation may exercise customs control and enforce public health and other regulations.

Related Terms


The zone off the coast of a nation immediately seaward from a base line. Sovereignty is maintained over this coastal zone by the coastal nation, subject to the right of innocent passage to the ships of all nations. The United States recognizes this zone as extending 4.8 kilometers from the base line.


Federal Water Pollution Control Act


A steel gate carried on crawler tracks that is used to control water flow through a spillway.


A sealing device used to control leakage from the stuffing box of a pump. Mechanical seals are usually made of two extremely smooth flat surfaces, one of which rotates on a shaft. The two flat surfaces are of such close tolerances as to prevent the passage of water between them.


Walls of stone or timber constructed down into the shallow water at right angles to the foreshore to minimise coastal erosion and sand drift from alongshore currents.


  1. The part of a body of water deep enough for navigation through an area otherwise not suitable. It is usually marked by a single or double line of buoys and sometimes by ranges. 2. The deepest part of a stream, bay, or strait, through which the main current flows. 3. A name given to certain large straits, such as the English Channel. 4. A hollow bed through which water may run. 5. A band of radio frequencies within which a radio station must maintain its modulated carrier frequency to prevent interference with stations on adjacent channels. Also called FREQUENCY CHANNEL.


Band or brace to attach the raw end of a hose to a water outlet.


Abbreviation for 'Transportation and Exportation.' Customs form used to control cargo movement from port of entry to port of exit, meaning that the cargo is moving from one country, through the United States, to another country.


A reservoir without control gates for storing water over brief periods of time until the stream has the capacity for ordinary flow plus released water; used for flood regulation.


A tidal datum that is the average of the highest high water height of each tidal day observed over the National Tidal Datum Epoch. For stations with shorter series, simultaneous obser- vational comparisons are made with a control tide station in order to derive the equivalent of a l9-year datum.

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