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Wednesday, 11 October 2006 05:11
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Online Hydropower Calculator

The calculator below can be used to calculate available hydroelectricity.

Density (kg/m3)


Volume flow (m3/s)

Head (m)


The theoretically power available from falling water can be expressed as

Pth = ρ q g h         (1)


Pth = power theoretically available (W)

ρ = density (kg/m3) (~ 1000 kg/m3 for water)

q = water flow (m3/s)

g = acceleration of gravity (9.81 m/s2)

h = falling height, head (m)

hydropower, volume flow, head and power generation

Due to energy loss the practically available power will be less than the theoretically power. Practically available power can be expressed as

P = 1000 μ q g h         (2)


P = power available (W)

μ = efficiency (in general ranging 0.75 to 0.95)

Equation (2) can be simplified to express practically available hydropower in kW

P ~ 10 μ q h (kW)

Last Updated on Sunday, 20 December 2009 16:31