A cubic metre per second (m
3s
−1, m
3/s, cumecs or cubic meter per second in
American English
American English, sometimes called United States English or U.S. English, is the set of varieties of the English language native to the United States. English is the most widely spoken language in the United States and in most circumstances i ...
) is the unit of
volumetric flow rate in the
International System of Units (SI) equal to that of a
stere or
cube with sides of in
length exchanged or moving each
second. It is popularly used for water flow, especially in
river
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of w ...
s 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
A Cartesian coordinate system (, ) in a plane is a coordinate system that specifies each point uniquely by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular oriented lines, measured i ...
or vertical axis of a flow
hydrograph
A hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow is typically expressed in cubic meters or cubic feet per second (cms or cfs).
It can als ...
, which describes the time variation of discharge of a river (the
mean
There are several kinds of mean in mathematics, especially in statistics. Each mean serves to summarize a given group of data, often to better understand the overall value (magnitude and sign) of a given data set.
For a data set, the '' ari ...
velocity multiplied by cross-sectional area). A moderately sized river discharges in the order of 100 cumecs.
Conversions
References
See also
*
Standard litre per minute
The standard liter per minute (SLM or SLPM) is a unit of volumetric flow rate of a gas at standard conditions for temperature and pressure (STP), which is most commonly practiced in the United States, whereas European practice revolves around the ...
*
Conversion of units
Conversion of units is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors which change the measured quantity value without changing its effects.
Overview
The process ...
*
Volumetric flow rate
*
Volumetric flux
In fluid dynamics, the volumetric flux is the rate of volume flow across a unit area (m3·s−1·m−2).
Volumetric flux has dimensions of volume/(time*area). The density of a particular property in a fluid's volume, multiplied with the volumetri ...
*
Cusec, shorthand for cubic feet per second
{{DEFAULTSORT:Cubic Metre Per Second
Units of flow
SI derived units