GATE AG 2008 • Q79 MCQ • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil and Water Erosion

Subtopic: Terraces and bunds

Question Statement:

Contour bunds are constructed on a land slope of 5% at a vertical interval of 1.35 m to store a 24 hour excess rainfall of 0.1 m. Minor effects due to side slopes of the bund are neglected in the calculation of storage volume of water behind the bund. The water spread length behind the bund is

Options:

  • (A) 12.4 m
  • (B) 10.4 m
  • (C) 8.4 m
  • (D) 6.4 m

Official Answer Key:

B

Step-by-Step Solution & Explanation

Water-spread (backwater) length = impounding depth/land slope = d/S = 0.52/0.05 = 10.4 m. Section 5 — Irrigation and Drainage Engineering

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