Answer:
The Environment Agency is responsible for flood risk management activities on main rivers, regulating reservoir safety, and providing river flood warnings. It has powers to undertake work on main rivers to fix flooding issues.
The natural movement of a body of water pushes sediment to the side, creating a natural levee. The banks of a river are often slightly elevated from the river bed. The banks form levees made of sediment, silt, and other materials pushed aside by the flowing water.
Natural levees raise the height of the stream channel, reducing the amount of flooding that will occur on the floodplain. Point bars are depositional features located along the outer portions of meander bends.
Explanation:
A flood occurs when a river or stream overflows its banks. Seasonal floods are the norm in many rivers, for example when spring rains or snowmelt increase the flow. During a flood, the channel is completely filled and water moves onto the floodplain and slows down. As it slows, it can carry less material. A lot of sand, silt, leaves, and other materials that were carried while the water was swirling along in the channel are dropped on the floodplain.
If a river has levees on only one side, some water is pushed across the river, flooding unprotected areas even more. ... In both cases, the water backs up, adding extra risk to nearby unprotected land upstream of the levee. Scientists consider it a given that levees make flooding worse.
