When the first slope change occurs at depths less than what, must a rope and float assembly be installed across the width of the pool?

The correct answer indicates that when the first change in slope occurs at a depth of less than 4'6", a rope and float assembly must be installed across the width of the pool. This requirement is based on safety regulations aimed at preventing accidents in areas where the pool transitions from shallow to deep water.

By implementing a rope and float assembly in this scenario, it provides a visual and physical barrier that encourages swimmers to remain in the shallow area. It informs users about the different depths and promotes safe swimming practices, especially in communal or commercial pool settings where there may be varying skill levels among swimmers.

Failure to comply with this regulation can lead to accidents, as swimmers may unintentionally venture into deeper waters without realizing the change in depth. Thus, establishing this safety measure at the specified depth is crucial for ensuring the safety and well-being of all pool patrons.