Which type of erosion forms large channels?

• A. Rill erosion
• B. Gully erosion
• C. Sheet erosion
• D. Wind erosion

Answer: (B)

Concentrated surface water that carves into the soil creates large channels. When runoff pools and follows a downcutting, concentrated path, it erodes the soil banks more aggressively and widens over time, forming deep, wide channels known as gullies. These channels are persistent and typically require rehabilitation beyond simple tillage.

Other forms of erosion don’t produce these large, defined channels. Sheet erosion removes a uniform layer from the surface without channels. Rill erosion forms small, near-surface grooves that are shallow and can often be repaired with standard tillage. Wind erosion, driven by air movement rather than water, creates different features like dunes or bare patches rather than water-carved channels.