P = ρQHg is the water power equation. Head ‘H’ is measured in meter ‘g’ gravity constant is measured in meter/second square, then the measuring unit of ‘Q’, the flow rate of water is:

• A. Meter per second
• B. Square meter per second
• C. Meter per hour
• D. Cubic meter per second

Answer: (D)

P = ρ QHg is the water power equation.
Where
H = heead = meter
g = gravity =m/s2
ρ =density  = (kg/m3)
P = power = watt = N-m/sec
Q = water flow rate = m3/sec