Question Bank • QB_SWCE_ADV_006 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil and Water Erosion

Subtopic: Terraces and bunds

Question Statement:

Contour bunds are to be constructed on agricultural land with a uniform land slope $S = 4\%$. Using the standard empirical formula for vertical interval $VI = \left( \frac{S}{3} + 2 \right) \times 0.3\text{ m}$, the horizontal spacing between successive bunds is ________ $\text{m}$ (answer in integer).

Answer Key:

25

Step-by-Step Solution & Explanation

1. Vertical Interval ($VI$): $VI = \left( \frac{4}{3} + 2 \right) \times 0.3 = \left( 1.3333 + 2 \right) \times 0.3 = 3.3333 \times 0.3 = 1.0\text{ m}$ 2. Horizontal Interval ($HI$) on $4\%$ slope ($S = 0.04$): $HI = \frac{VI}{S/100} = \frac{1.0\text{ m}}{4/100} = \frac{1.0}{0.04} = 25.0\text{ m}$
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