A wall used to prevent flooding that is not a dam is a dike.
flood barriers
marshland prevent flooding to a nearby town by temporarily storing water
Flooding is a natural event that humans are not able to stop. There are ways to prevent flooding by retaining walls such as dams, levees and reservoirs. Another way is to use vegetation such as grass, trees and shrubs to help protect the land from moving water and erosion.
Temporarily storing water
Dikes
levees are artificial or natural slopes or walls to prevent flooding of a river.
A dike. Not a dam.
The Thames Barrier was built to prevent London from flooding at a very high tide.
To help prevent flooding in London.
Nope... a delta - is the natural mouth of a river. A levee is an artificial bank built up to prevent flooding of low-lying areas.
flood barriers
Flood barriers
The Thames Barrier is a device that can be raised across the river Thames to prevent London from flooding during particularly high tides.
Dikes and levees prevent flooding by forming a barrier against rising waters.
The Thames Barrier is a flood prevention barrier on the river Thames east of London. Its purpose is to prevent London flooding at times of exceptionally high tides.
The skin
The Thames Barrier is used to prevent London from flooding. Under normal conditions it lies on the bed of the river Thames and is only raised when an exceptionally high tide is expected.