The 'sub-surface drainage' system for controlling waterlogging uses:
Choose the correct answer
Pumping water from surface ponds
Perforated/slotted pipes buried at root zone depth collecting groundwater and conveying it by gravity to outlets
Lining all irrigation channels
Planting trees only
Correct Answer
B. Perforated/slotted pipes buried at root zone depth collecting groundwater and conveying it by gravity to outlets
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Sub-surface drainage: perforated pipes (PVC slotted drains, IS 6068) or mole drains buried at 1.0–1.5 m depth; water infiltrates through slots, flows by gravity to collector drain. Spacing 20–50 m depending on soil hydraulic conductivity. Design: by Hooghoudt''s equation (drain spacing for target water table). Surface drainage: field ditches for ponded water removal (separate system).
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