Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Biological and engineering measures to control erosion
Question Statement:
Shelterbelts and windbreaks constructed perpendicular to the prevailing erosive wind provide effective velocity reduction and soil conservation on the leeward side up to a distance of approximately:
Options:
(A) 2 to 5 times tree height ($H$)
(B) 15 to 20 times tree height ($H$)
(C) 40 to 50 times tree height ($H$)
(D) 70 to 80 times tree height ($H$)
Answer Key:
B
Step-by-Step Solution & Explanation
A permeable windbreak protects soil surfaces up to 2 to 5 times tree height ($H$) on the windward side and 15 to 20 times $H$ on the leeward side.