Born a Hero by Mimi Barbour

Bryce’s day turns upside down when he reaches out to help an elderly lady during a raging storm. By the time he gets her safely home, the levee breaks, and they’re in deep… ahh, water. This lovely woman soon becomes his helper, saving folks from terrible consequences during the ensuing nightmare.
First they rescue a small child from drowning in a car, then a woman floating by, clinging for life to an uprooted tree, and even a puppy in terrible danger.
If Dena hadn’t gotten out of her vehicle to pay for her gas, she would have been in the car when the wave of water washed it away. Her poor little boy wouldn’t have had to face the fearful conditions alone.
Instead, she’s left clinging to a pole, while strong winds, lightning, and heavy, freezing rain falls all around her. Death is close. But the fear for her son overrides everything else as she battles the storm in the fight for her life.