The 'specific yield' of an aquifer (Sy) represents:
Choose the correct answer
Total volume of water in the aquifer
Volume of water that drains by gravity per unit area per unit drop in water table (drainable porosity)
Daily recharge rate
Rate of seepage into the aquifer
Correct Answer
B. Volume of water that drains by gravity per unit area per unit drop in water table (drainable porosity)
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Specific yield Sy: volume of water released from unconfined aquifer per unit area per unit decline in water table (drainable porosity). Sy = n − Sr (n = total porosity, Sr = specific retention). Typical: fine sand Sy ≈ 0.10–0.20; coarse sand/gravel ≈ 0.25–0.35; clay < 0.05. Specific storage Ss (for confined aquifer) is different (elastic storage).
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