Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Terraces and bunds
Question Statement:
In hilly agricultural areas with high rainfall and heavy clay soils subject to waterlogging, which type of bench terrace is specifically constructed with a slight reverse slope toward the hill face draining into an inner toe furrow?
Options:
(A) Inward sloping bench terrace
(B) Outward sloping bench terrace
(C) Level (table-top) bench terrace
(D) Contour vegetative hedge
Answer Key:
A
Step-by-Step Solution & Explanation
- Inward sloping bench terrace: Has a reverse slope towards the hillside with a drainage ditch along the toe to safely collect and conduct excess surface runoff into a grassed waterway in high-rainfall zones.
- Outward sloping: Used in low-rainfall permeable areas to distribute water.
- Level: Used in medium rainfall for paddy or uniform moisture conservation. Option A is correct.