1. Floodplains and Levées
By Stephanie and Priyanka

2. What’s a floodplain? Flat land adjacent to a stream or river
Bank full stage = maximum safe water level

3. Active floodplain – where it gets flooded most

4. Terrace Made of former floodplains
There can be more than one terrace in a floodplain

5. What do floodplains do? Supper rich ecosystems
Store rich nutrients in the soil
This makes it valuable agricultural land
Decreases a flood’s damageability

6. How are floodplains formed?
Lateral accretion:
Erosion occurs on the outside
Deposition occurs simultaneously
Material continuously builds up

7. Vertical accretion
Material deposited when the river floods
Silt builds up the floodplain

9. Levées

10. Types of levees Mainline and tributary levées Ring levées
Setback levées
Sublevees

11. Natural Levees in New Orleans