Correct option is D
Trash rack, forebay, surge tank, and spill way are terms associated with hydroelectric power plants.
Here's some information about each of these components:
· Trash rack: A filter installed in the intake system of a hydroelectric power plant to prevent large debris from entering and damaging the turbine. Trash racks can be made of wood or metal, and are often supported by masonry.
· Surge tank: A reservoir or standpipe located between the main storage reservoir and the powerhouse. The surge tank's main function is to absorb pressure spikes and provide extra water when pressure drops.
