Floods and Droughts - 13 of 12

Floods and Droughts FAQs - 12 Found

Load first FAQ in this category.



Load last FAQ in this category.
What are the two types of flooding?

There are two basic kinds of floods, flash floods and the more widespread river flooding. Flash floods generally cause greater loss of life and river floods generally cause greater loss of property.

A flash flood occurs when runoff from excessive rainfall causes a rapid rise in the stage of a stream or normally dry channel. Flash floods are more common in areas with a dry climate and rocky terrain because lack of soil or vegetation allows torrential rains to flow overland rather than infiltrate into the ground.

River flooding is generally more common for larger rivers in areas with a wetter climate, when excessive runoff from longer-lasting rainstorms and sometimes from melting snow causes a slower water-level rise, but over a larger area. Floods also can be caused by ice jams on a river, or high tides. However, most floods can be linked to a storm of some kind.

Tags: Ecosystems, Floods, Rivers, Water, Measurement, Streams, Streamgages