A 'tube well' with a strainer (filter) at its base is designed for:
Choose the correct answer
Drawing water from surface sources
Tapping alluvial aquifers — screened to prevent sand entry while allowing water inflow; gravel-packed for fine aquifers
Recharging groundwater only (injection well)
Oil and gas drilling
Correct Answer
B. Tapping alluvial aquifers — screened to prevent sand entry while allowing water inflow; gravel-packed for fine aquifers
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Tube well (boring): drilled into alluvial aquifer (sand/gravel). Strainer/screen slots sized to retain aquifer material while allowing water entry. Gravel pack placed between strainer and bore hole wall (artificial gravel pack) if natural formation too fine. Slot size: 50–70% of aquifer d50. Pumped by submersible pump. Used in: Punjab/Haryana/UP Indo-Gangetic plains (very common for irrigation).
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