<P> A cubic metre per second (m s, m / 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 . </P> <P> 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 . </P> <Table> <Tr> <Td> 1 cubic metre per second </Td> <Td> = </Td> <Td> 7003100000000000000 ♠ 1000 </Td> <Td> litres per second </Td> </Tr> <Tr> <Td> </Td> <Td> = </Td> <Td> 7001600000000000000 ♠ 60 </Td> <Td> kilolitres per minute </Td> </Tr> <Tr> <Td> </Td> <Td> = </Td> <Td> 7001864000000000000 ♠ 86.4 </Td> <Td> megalitres per day </Td> </Tr> <Tr> <Td> </Td> <Td> = </Td> <Td> 7001315576000000000 ♠ 31.5576 </Td> <Td> gigalitres per year </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 7002219969248000000 ♠ 219.969 248 </Td> <Td> imperial gallons per second </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 7002264172051000000 ♠ 264.172 051 </Td> <Td> US gallons per second </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 7001353144540000000 ♠ 35.314 454 </Td> <Td> cubic feet per second </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 7000130500000000000 ♠ 1.305 </Td> <Td> cubic yards per second </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 7004255664970000000 ♠ 25 566. 497 </Td> <Td> acre - feet per year </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 7009111367662100000 ♠ 1113676621 </Td> <Td> cubic feet per year </Td> </Tr> <Tr> <Td> </Td> <Td> ≈ </Td> <Td> 6997757090916000000 ♠ 0.007 570 909 16 </Td> <Td> cubic miles per year </Td> </Tr> </Table> <Tr> <Td> 1 cubic metre per second </Td> <Td> = </Td> <Td> 7003100000000000000 ♠ 1000 </Td> <Td> litres per second </Td> </Tr>

Flow rate of irrigation water one cumec-day equals to quantity of water
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