Answer:
Two factors are water speed and amount of water.
Step-by-step explanation:
The production of hydro electrical power can be done when the water passes from the dam to the rivers which are below dam.
Turbines which are surrounded by magnets produce the electricity when the flowing water is hit on the turbines than turbines rotates and produce electricity and turbines are present in the dam.
The energy production of the Hoover dam is based on the amount or pressure of the water if the more water is passing through the intake pipe then there is more production of energy. An artificial lake is created behind the dam.
And energy production also depends on the speed of water means if the speed of water is large then it rotate the turbine faster and increase the production.