A cubic foot per second (also cfs, cusec and ft³/s) is an Imperial unit / U.S. customary unit of flow rate equal to a cube with sides each 12 inches (1 foot or 472.44 centimetres) in length exchanged or moving each second. It is not an SI or metric unit. Current official usage is largely confined to the United States and Canada, but like many imperial units which have officially been "abolished" in the United Kingdom, it remains familiar in that country, with extensive unofficial usage. It is popularly used for water flow, especially in rivers and streams, and for HVAC measurements of air flow. The Imperial units or the Imperial system is a collection of English units, first defined in the Weights and Measures Act of 1824, later refined (until 1959) and reduced. ... The U.S. customary units (more commonly known in the US as English units or standard units) are the non-metric units of measurement that are presently used in the United States, in some cases alongside the metric system of units. ... Three dimensions A cube (or hexahedron) is a Platonic solid composed of six square faces, with three meeting at each vertex. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial and U.S. customary unit of length. ... A foot (plural: feet) is any of several old units of distance or length, measuring around a quarter to a third of a meter. ... A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundredth of a metre, the current SI base unit of length. ... Length is the long dimension of any object. ... Look up second in Wiktionary, the free dictionary. ... Cover of brochure The International System of Units. ... The International System of Units (symbol: SI) (for the French phrase Syst me International dUnit s) is the most widely used system of units. ... River upstream of an Australian trout farm A river is a large natural waterway. ... A running stream. ... All-air and air-water HVAC systems use air ducts, outlets, and inlets installed throughout their buildings. ...

Symbols

There is no universally agreed symbol but the following are used:

• cfs
• ft^3/sec
• ft³/sec
• cusec

Conversions

1 cubic foot per second is the same as:

• 1,728 cubic inches per second
• 7.48051945 gallons per second
• 28.3293425 litres per second
• 0.0283293425 cubic metres per second
• 31,536,000 cubic feet per year
• 0.000214242111 cubic miles per year
• 723.966942 acre feet per year

A cubic inch is the volume of a cube which is one inch long on each edge. ... The gallon (abbreviation: gal) is an English unit of volume. ... The litre or liter (U.S. spelling, see spelling differences) is a unit of volume. ... A cubic metre per second (m3·s−1, m3/s or cubic meter per second in American English) is a derived SI unit of flow rate equal to that of a cube with sides one metre (100 centimetres or 39. ... The cubic foot (symbols ft³, cu. ... An acre foot is a unit of volume commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, and river flows. ...

See also

• 1 E-1 m³ for a comparison with other volumes
• Cubic mile
• Orders of magnitude (volume)
• Conversion of units

To help compare different orders of magnitudes this page lists volumes from at 10-1 m3 to 1 m3. ... A cubic mile is an Imperial unit/U.S. customary unit (non-SI non-metric) of volume, used in the United States. ... The pages linked in the right-hand column contain lists of volumes that are of the same order of magnitude (power of ten). ... Conversion of units refers to conversion factors between units of measurement. ...

External links

• Conversion of volumetric flow rate units