How did shelterbelts help protect Great Plains farms from wind erosion?

Shelterbelts, also known as windbreaks, were instrumental in protecting Great Plains farms from wind erosion by acting as physical barriers that slowed and redirected the wind. During the Dust Bowl, these massive plantings of trees and shrubs were strategically positioned perpendicular to prevailing winds to reduce wind velocity.123

By decreasing wind speed, shelterbelts helped mitigate soil erosion in several ways:

• Reduced Velocity: A medium-thick shelterbelt can reduce wind velocity by more than 10 percent for a significant distance on the leeward side, preventing the wind from picking up and carrying away exposed topsoil.31
• Moisture Retention: By lowering wind speeds, shelterbelts decreased the rate of transpiration in crops and reduced evaporation from the soil, helping to maintain necessary moisture levels.31
• Snow Distribution: In colder periods, they helped distribute snow evenly across fields, ensuring better soil moisture storage when the snow melted.31

Through the federal Prairie States Forest Project, over 200 million seedlings were planted between 1935 and 1942, creating thousands of miles of windbreaks that successfully helped halt the devastating erosion of the era.2