|Unit of||Volumetric flow rate|
|US gallons/s||264 million|
In oceanography, the sverdrup (symbol: Sv) is a non-SI metric unit of flow, with equal to 1 million cubic metres per second (260,000,000 US gal/s); it is equivalent to the SI derived unit cubic hectometer per second (symbol: hm3/s or hm3?s-1). It is used almost exclusively in oceanography to measure the volumetric rate of transport of ocean currents. It is named after Harald Sverdrup. It is distinct from the SI unit sievert or the non-SI svedberg, which use the same symbol.
In the context of ocean currents, one million cubic meters per second may be most easily imagined as a "slice" of ocean with dimensions × × (width × length × thickness). At this scale, these units can be more easily compared in terms of width of the current (several km), depth (hundreds of meters), and current speed (as meters per second). Thus, a hypothetical current wide, 500 m (0.5 km) deep, and moving at 2 m/s would be transporting of water.