Subtopic: Planning, design and layout of surface and sub-surface drainage systems
Question Statement:
Tile drains in soil of permeability 2.3×10⁻³ mm/s. Impermeable stratum at 3.2 m below surface; water table to be kept ≥1.0 m below surface. Average drainage discharge 2.0 mm/day. Drains placed at 1.5 m below surface (equivalent depth = tile depth). The drain spacing in m is: [note: marked "Marks to All" in the official key owing to an ambiguity/error in the original question]
Options:
(A) 10.6
(B) 12.4
(C) 13.9
(D) 19.7
Official Answer Key:
MARKS TO ALL
Step-by-Step Solution & Explanation
Section 6 — Agricultural Process Engineering
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