Question Bank • QB_SWCE_EXP_031 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil and Water Erosion

Subtopic: Terraces and bunds

Question Statement:

A graded contour bund is to be laid on agricultural land having a land slope $S = 4.0\%$. If the vertical interval $VI$ in meters is calculated using Ramser's formula $VI = \frac{S}{3} + 0.6$, the corresponding horizontal interval ($HI$) between consecutive bunds in meters is ________ (round off to 1 decimal place).

Answer Key:

48.3

Step-by-Step Solution & Explanation

1. Vertical Interval ($VI$): $VI = \frac{S}{3} + 0.6 = \frac{4.0}{3} + 0.6 = 1.3333 + 0.60 = 1.9333\text{ m}$ 2. Horizontal Interval ($HI$): $HI = \frac{VI}{S/100} = \frac{1.9333}{0.04} = 48.33\text{ m} \approx 48.3\text{ m}$
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