Rapid water-level rise in a river in downtown Columbus, Georgia, presents a big challenge for emergency responders. Despite warning signs and emergency sirens, unknowing visitors can be swept away by rushing whitewater. Georgia Tech researchers have worked with the city to develop a smart river safety digital twin including a camera system that will recognize when people on or near the river are in trouble. It will send specific warnings and location information to emergency responders who can take action for drowning prevention or rescue.