Diagrams and footage show the areas of America most affected by floods.
Titles read: "THE MENACE OF THE FLOOD!"
United States of America.
Quick montage of shots showing flooded land - probably in various regions across the United States. A map shows the area most affected by floods in America, around the Mississippi River and tributaries. Animated diagrams show the kind of countryside in this area, where snow melting from mountains run down to the rivers, causing them to overflow.
More diagrams and live footage show how flooding can be prevented by building up the riverbanks (levying), making dams - footage of Boulder Dam, replanting of forests which soak up water and huge barriers - footage of viaducts in the Tennessee Valley.