Where is the strongest point of suction in a swimming pool, which may lead to entrapment?

The strongest point of suction in a swimming pool is typically found at the main drain. This area can create a powerful force that can potentially entrap individuals or objects if they come into contact with it. The main drain is strategically positioned at the pool's deepest point, which helps facilitate effective water circulation and prevents debris accumulation. Because of its location and the function it serves, it is at the main drain that the suction force is at its peak, making it critical for pool operators to ensure that proper safety measures, such as anti-entrapment devices or dual main drains, are in place to reduce the risk of accidents.

Other options, such as skimmer openings, deep end returns, and shallow end outlets, do experience suction; however, the force exerted at these points is generally not as strong as that found at the main drain. This is due to their design and function, which primarily focus on surface skimming and water return rather than deep water suction. Therefore, the main drain is the area of greatest concern for entrapment risk.