What Happened to All That People There?

Even four stories up, jack could hear the roaring river. The water began to change colors. It went from this kind of bluish color to being very murky. He understood that if the wave got as far as his town, further inland, it had to have hit george's town right on the coast. What happened to all those people there, to georgia? And suddenly he knew he had to find this girl. Just had to.