Correct.
Before a major typhoon comes, some water in the reservoir is often drained to free up storage capacity. When the typhoon blows, the reservoir is filled again.
Typhoon is a type of tropical cyclone. A tropical cyclone is a low-pressure vortex that occurs on the tropical or subtropical ocean. It is a powerful and deep "tropical weather system." my country divides tropical cyclones in the South China Sea and the northwest Pacific into six levels based on the maximum average wind strength near the bottom center.