When should the pool be cleared during heavy rain?

Clearing the pool when you can no longer see the bottom is important for several safety reasons. Visibility plays a crucial role in monitoring swimmers, preventing accidents, and ensuring that all participants are accounted for. Heavy rain can cause water to become murky and obscure vision, making it difficult to see if anyone is in distress or if there are any potential hazards submerged in the water. Therefore, when visibility is compromised, it is essential to clear the pool to ensure the safety of all swimmers.

While other options may touch on relevant safety concerns, they do not address the immediate visual assessment required for safe operations. For instance, clearing the pool only after the rain stops or waiting for maintenance staff does not prioritize swimmer safety when visibility is already impaired. Similarly, acting based solely on the sound of thunder does not consider visibility, as the rain could still render the water unsafe for swimming even if a thunderstorm has not begun or is no longer active.