When does a meander develop?

Meander formation

Water flows faster on the outer curve of the bend of a river and slower on the inner curve so the outer bank gets eroded, but silt is deposited at the inner bank. Over time as the outer bank wears and the inner one grows, a meander forms. As the process continues, the meander becomes more loopy.

If you doing this for work/school I suggest you use diagrams/pictures to show each stage.