Final answer:
The lifeguard supervisor is implementing 'zone coverage' to ensure each lifeguard has fewer patrons to watch, enhancing safety and quick response times.
Step-by-step explanation:
The type of coverage the lifeguard supervisor is setting up by arranging multiple lifeguard stations to reduce the number of patrons each lifeguard is responsible for is commonly referred to as zone coverage. Zone coverage is a strategy used to ensure effective patron surveillance by dividing the swimming area into specific zones, with each lifeguard assigned to watch over their designated area. This system helps in minimizing the risk of accidents because lifeguards can focus on a smaller area and respond more quickly to emergencies.