Examples include restoring floodplains instead of building taller levees and planting trees and installing green roofs, rather than enlarging sewers or building a costly new treatment plant.
Obama promised he would strengthen the levees so that they can withstand strong hurricanes if he is elected President.
Tractors are tilling the land and building earthen rows that will serve as levees once water flows into these fields.
Most of the storm's casualties occurred in southeast Louisiana, where flooding washed away many of the levees protecting the area.
