i) Function of Storage reservoir:- Its function is to store the water during rainy season and supplies the same throughout the year.
ii) Function of Intake:- The water from reservoir is released and controlled by opening & closing gates. OR When the intake gates are opened the water flows due to gravity towards water ways.
iii) Function Trash rack:- Its function is to avoid entry of debris (solid particles, large fish, ice, etc.) going towards the turbine. OR It avoids choke up of penstock and damage to turbine due to solid particles.
iv) Function Tail race:- To carry the water leaving from turbine. OR Tailrace path of water is connected to the next stage of generation/river/lake/ ocean.