Question Bank • QB_SWCE_ADV_150 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil and Water Erosion

Subtopic: Terraces and bunds

Question Statement:

A farm field has a uniform land slope of $S = 4.0\%$. Using Ramser's empirical formula for contour bunding in medium rainfall zones, $VI = 0.305 (0.60 S + 2.0)$, where $VI$ is vertical interval in meters and $S$ is land slope in percent. The corresponding horizontal spacing ($HI$) between consecutive contour bunds in meters is ________ (round off to one decimal place).

Answer Key:

33.6

Step-by-Step Solution & Explanation

1. Vertical interval ($VI$): $VI = 0.305(0.60 \times 4.0 + 2.0) = 0.305(2.40 + 2.0) = 0.305 \times 4.40 = 1.342\text{ m}$ 2. Horizontal interval ($HI$) relation to land slope $S$: $HI = \frac{VI}{S / 100} = \frac{1.342}{0.040} = 33.55\text{ m} \approx 33.6\text{ m}$
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