Cubic metre per second
A cubic metre per second (m3⋅s−1, m3/s, cumecs or cubic meter per second in American English) is a derived SI unit of volumetric flow rate equal to that of a stere or cube with sides of one metre (~39.37 in) in length exchanged or moving each second. It is popularly used for water flow, especially in rivers and streams, and fractions for HVAC values measuring air flow.
The term cumec is also used, as shorthand for "Cubic metres per second", with the plural form cumecs also common in speech. It is commonly used between workers in the measurement of water flow through natural streams and civil works, but rarely used in writing. Data in units of cumec are used along the y-axis or vertical axis of a flow hydrograph, which describes the time variation of discharge of a river (the Mean velocity multiplied by cross-sectional area). A moderately sized river discharges in the order of 100 cumecs.
1 cubic metre per second is the same as:
- 1,000 litres per second
- 60,000 Standard Litres Per Minute
- ca 157 1⁄2 cubic fathoms per second
- 264.172051 US gallons per second
- 35.314454 cubic feet per second
- ca 1.305 cubic yards per second
- 86.4 ML/day megalitres per day
- 25,566.497 acre-feet per year
- 31,536,000 cubic metres per year
- 1,113,676,621 cubic feet per year
- 0.00757090916 cubic miles per year
- "Units: C", The University of North Carolina at Chapel Hill, webpage: UNC-Rowlett.