Hydropower
Hydraulic (Water) Power Input
P_{water} = \rho \times g \times Q \times H
Variables
| Pwater | Gross hydraulic power available | W |
| ρ | Water density | kg/m³ |
| g | Gravitational acceleration | m/s² |
| Q | Discharge | m³/s |
| H | Gross head | m |
Engineering Example
At Q = 5 m³/s and H = 40 m: Pwater = 1000×9.81×5×40 ≈ 1.962 MW (before any turbine/generator losses).
Practical Site Example
The theoretical ceiling on output, used to sanity-check a plant's overall efficiency claim.