Floodplain Landforms


Floodplain Landforms Have 3 Main Characteristics:

  1. A generally flat area of land
  2. Borders a river
  3. Floods when the river is exceptionally high

Example of a Floodplain Landform:

Mississippi River floodplain, USA
The floodplain picture is also of a mountain view above.

What is a Floodplain Landform?

A floodplain is a primarily flat area of land bordering a river that floods when the river is unusually high. If the area has flooded at least once during the last 100 years, it may be considered an active floodplain.

How are Floodplains Formed?

A floodplain is formed by the action of water that redistributes sediment evenly during repeated flooding.

How Large is a Floodplain?

A floodplain may be only a few square miles, or in some cases cover tens of thousands of square miles of land.

Where Can a Floodplain Be Found?

A floodplain can be found bordering many rivers where flooding has occurred.

Famous Floodplains

• Mississippi River floodplain, USA
• Pantanal floodplain, Brazil, Bolivia and Paraguay
• Amazon River floodplain, Brazil
• Ganges River and Brahmaputra River floodplain, Bangladesh and India

The Mississippi River has a large floodplain covering large portions of midwestern states through which it flows. Ninety percent of this area is no longer flooded annually due to levees designed to hold the water back. As a result, farmland no longer receives the benefits of flooding that can enrich the soil. Because there is so much flood control, the level of the river can rise much higher.

When a levee breaks, the flooding can be much worse as occurred most recently in 2011. Along the Paraguay River in west-central Brazil and parts of Bolivia and Paraguay lies the Pantanal, a floodplain of more than 77,000 square miles.

The Pantanal is considered one of the richest ecosystems in the world, created by the annual flooding of the land. Swamps, grasslands and forested areas are all found in this region which supports more than 700 species of birds and large mammals, including many endangered species that are hard to find in other areas.

The Amazon River floods approximately 100,000 square miles of rainforest covered floodplain each year during the wet season, maintaining the soil and the rich nature of the habitat. Over one third of the world’s known species of plant and animal life are found here.

In the countries of India and Bangladesh, an extensive floodplain borders the Ganges and Brahmaputra rivers. The floodplain covers 80% of Bangladesh and annual flooding kills hundreds of people each year. When flooding is greatest, over 75% of the country may be covered by water, causing much loss of life and property. During the flooding of 2007, over 1100 lives were lost.

Floodplain definition:

A flat area of land next to a river that floods when the river is very high.

Related: Flats

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