10-30 liter blir veldig lite strøm

P = hrgk
where P is Power in kilowatts, h is height in meters, r is flow rate in cubic meters per second, g is acceleration due to gravity of 9.8 m/s2, and k is a coefficient of efficiency ranging from 0 to 1. Efficiency is often higher with larger and more modern turbines.

Hvis du erstatter m3 med liter, og kW med W, får du mere passende verdier