Which statement about Rills and Gullies is true?

Which statement about Rills and Gullies is true?

• A. Rills are up to 3 inches deep; Gullies formed from three or more rills deeper than 3 inches.
• B. Rills are deeper than Gullies.
• C. Rills and Gullies are always separate.
• D. Gullies are shallow channels less than 1 inch deep.

Answer: (A)

Rills and gullies illustrate erosion progression from small, shallow channels to larger, deeper ones as runoff concentrates and soil is removed. Rills are the small, shallow channels formed by concentrated flow, typically up to about 3 inches deep. When multiple rills occur and deepen, they can connect and widen into a gully, which is deeper than the individual rills. The statement captures that rills are up to 3 inches deep and that a gully forms from several rills when the channel exceeds that depth, aligning with how these features are classified in erosion control practice. Rills aren’t deeper than gullies—gullies are deeper and more substantial. Rills and gullies aren’t always separate features; gullies can originate from rills that coalesce and deepen. Gullies aren’t shallow channels under 1 inch deep; they are substantially deeper.

Rills and gullies illustrate erosion progression from small, shallow channels to larger, deeper ones as runoff concentrates and soil is removed. Rills are the small, shallow channels formed by concentrated flow, typically up to about 3 inches deep. When multiple rills occur and deepen, they can connect and widen into a gully, which is deeper than the individual rills. The statement captures that rills are up to 3 inches deep and that a gully forms from several rills when the channel exceeds that depth, aligning with how these features are classified in erosion control practice.

Rills aren’t deeper than gullies—gullies are deeper and more substantial. Rills and gullies aren’t always separate features; gullies can originate from rills that coalesce and deepen. Gullies aren’t shallow channels under 1 inch deep; they are substantially deeper.