Question

Advanced stage of water erosion is:

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

Hint:

Sequential memory aid: Splash $\rightarrow$ Sheet $\rightarrow$ Rill $\rightarrow$ Gully. Gully erosion is often called the "cancer of the land" because once it reaches this stage, the land is nearly impossible to cultivate without massive engineering.

Answer 1

The Correct Option is D

Concept: Water erosion is a progressive process that occurs in distinct stages depending on the intensity of rainfall and the slope of the land. Understanding these stages is vital for planning soil conservation measures.

Step 1: Follow the sequence of erosion.
1. Splash Erosion (3): The first stage, caused by the direct impact of raindrops on bare soil.
2. Sheet Erosion (1): Uniform removal of a thin layer of topsoil. It is the most "insidious" as it often goes unnoticed by farmers.
3. Rill Erosion (2): Occurs when runoff water forms small, well-defined channels (finger-like) that can be removed by normal tillage.

Step 2: Identify the advanced stage.
Gully Erosion (4) is the advanced stage where rills deepen and widen into large channels that cannot be obliterated by ordinary tillage equipment. It represents a severe loss of land productivity and is the most visible and destructive form of water erosion.