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The sverdrup, named in honour of the pioneering oceanographer Harald Sverdrup, is a unit of measure of volume transport. It is used almost exclusively in oceanography, to measure the transport of ocean currents. Its symbol is Sv. Note that the sverdrup is not an SI unit, and that its symbol conflicts with the sievert's. It is equivalent to 10⁶ cubic meters per second (0.001 km³/s, or about 264 million U.S. gallons per second). The entire global input of fresh water from rivers to the ocean is equal to about 1 sverdrup.

Recent studies suggest that the water transport in the Gulf Stream steadily increases from 30 Sv in the Florida Current to a maximum of 150 Sv at 55°W longitude. The heat carried within this large volume is roughly half responsible for the mild climate of north-western Europe. (Atmospheric heat transport accounts for the other half.)

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