Which hazard is primarily concerned with the risk of drowning in water rescues?

The hazard primarily concerned with the risk of drowning during water rescues encompasses all of the listed factors: depth, temperature, and water velocity. Depth is crucial because it determines how submerged a victim may be and the challenges faced by rescuers when attempting to retrieve someone from deep water. Temperature plays a significant role as cold water can lead to hypothermia, affecting both the victim's ability to float and the rescuer's effectiveness in the rescue effort. Water velocity is critical as fast-moving water can create strong currents, making it difficult for both the victim and rescuers to maintain control or position themselves safely. Therefore, recognizing that each of these hazards contributes to the complexities of water rescues underscores why considering all of these factors is essential for safety and effectiveness in such situations.