Allied & ICAR Exam Bank • ALLIED_0939 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Surface Irrigation Systems

Subtopic: Surface Irrigation Systems

Question Statement:

Surge flow irrigation (intermittent on-off cycling of water into furrows) increases surface advance uniformity primarily because:

Options:

  • (A) Intermittent wetting and resting collapses surface macropores and forms a sediment seal, sharply reducing infiltration rate in the wetted upstream section
  • (B) Water becomes warmer
  • (C) Soil slope steepens automatically
  • (D) Pumping power increases tenfold

Answer Key:

A

Step-by-Step Solution & Explanation

During off-periods, tension pulls fine suspended particles into soil surface pores and surface soil consolidates, creating an intake-reducing seal that lets subsequent surges advance rapidly over pre-wetted soil.
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