The fast current of a flash flood is one of its biggest dangers. But if someone is trapped by a flash flood— clinging to a tree branch or perched on the roof of a car—try using that speed to your advantage.
Tie a rescue rope to a solid object (a tree, for example) to anchor it against the weight of the victim and the flowing water’s immense pressure.
Coil the rescue rope and throw it upstream of the person you’re rescuing, allowing the current to carry the line to the victim. Instruct that person to tie the rope around his or her waist.
Once secured to the rope, the victim can leave his or her perch and work toward the shore.