Levées (Fluvial Deposition)

Question 1

What material are levées made up of?

Answer 1

Coarse materials

Question 2

How are levées formed?

Answer 2

If the river floods the velocity falls as it overflows the banks = deposition as the competence is suddenly reduced = levées

Question 3

What increases the size of levées?

Answer 3

Subsequent floods and further deposition on the bed of the river occurs.

Question 4

Why do authorities sometimes strengthen levées and increase their heights?

Answer 4

After floods and channel sediment build-up, the river flows at a higher level than the floodplain.