Allied & ICAR Exam Bank • ALLIED_0918 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Micro-Irrigation Systems

Subtopic: Micro-Irrigation Systems

Question Statement:

A subsurface drip irrigation lateral installed at depth $d = 30\text{ cm}$ delivers water into clay loam soil where upward capillary rise from the emitter is $h_c = 22\text{ cm}$. The distance from the soil surface to the top of the upward capillary wetting front ($30 - 22$) in cm is:

Answer Key:

8.0

Step-by-Step Solution & Explanation

Depth to wetting front $= 30 - 22 = 8.0\text{ cm}$ (leaving the top 8 cm dry, drastically cutting soil evaporation).
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