More than 300 flooding reports have occurred across the U.S. since last Friday, with more heavy rain expected from Texas to the Mid-Atlantic.

Hurricane Katrina is the deadliest flood event in the U.S. in the past 25 years. The storm crashed into the Gulf Coast and caused devastating flooding when levees failed in New Orleans, where people had to be rescued by boat and helicopter from rooftops.

Broken tree limbs, twisted metal, crumpled cars and muddy debris remained as crews worked to clear roads and culverts in the wake of Tuesday's flash flood that killed three people — including two children — and significantly damaged as many as 50 homes,