Bench terrace sloping outwards are effective only in

Correct option is B

The correct answer is (B) Low rainfall area

Explanation:
• Bench terracing is a soil conservation practice used on steep slopes to reduce runoff and erosion. There are three main types based on the slope of the bench: level, sloping inward, and sloping outward.
• Outward Sloping Terraces: The flat part of the terrace (the bench) slopes slightly away from the hill. These are designed to allow excess water to flow over the edge of the terrace.
• Because they encourage water to move off the terrace, they are only safe and effective in low rainfall areas where the amount of runoff is small and unlikely to cause severe 'gully' erosion at the terrace edge.
• In high rainfall areas, outward sloping terraces would lead to catastrophic erosion of the terrace banks.

Information Booster:
• [Image showing cross-sections of level, inward-sloping, and outward-sloping bench terraces]
• Inward Sloping Terraces: These slope toward the hill and are used in high rainfall areas to collect water and safely channel it away through a protected drain.
• Bench terracing is usually recommended for slopes between 6% and 33%.

Additional Knowledge:
• High/Heavy rainfall areas (Options A and D): Require inward-sloping terraces to prevent the 'waterfall' effect from destroying the field.
• Medium rainfall areas (Option C): Usually utilize level terraces to maximize moisture absorption.