Hydroelectric power is produced using the energy of moving water. Which description tells how this process is accomplished? Water flowing downstream moves through a reservoir in a dam and past turbines. It then moves through channels and cause a generator to produce electricity. Water flowing upstream moves through a channel in a dam. The water moves though a generator that produces electricity, and then it moves to a reservoir. Water flowing upstream is help in a reservoir behind a dam. The water moves up through channels in the dam where it flows past turbines, moving them and creating electricity. Water flowing downstream is held up in a reservoir behind a dam. Some water moves down channels through turbines connected to generators which produce electricity.