Mine safety for water hazards. Seconds matter.
The Mine Safety Health Act requires that water floatation devices be easily accessible when a water hazard exits. Water rescue devices must be easily accessible. I take this to mean that 1) water rescue devices are very kept very close to potential water hazard exposures. 2) All employees know where the water rescue devices are located. 3) conduct workplace exams with a specific focus on water hazards so potential elimination of such hazards can be implemented.
MSHA has a great Safety Alert at https://www.msha.gov/news-media/alerts-hazards/mnm-safety-alert-water-related-safety that can help you address water hazards.
Remember, water rescues need to be conducted in seconds, not minutes. If a person in the water cannot be removed or the water rescue device is not delivered in a few seconds call 911 immediately. But continue attempts to help the person in the water.