The 'specific capacity' of a well is defined as:
Choose the correct answer
Total water available in the aquifer
Well discharge per unit drawdown (Q/s) — measure of well productivity and aquifer transmissivity
Depth of water table from surface
Volume of well casing
Correct Answer
B. Well discharge per unit drawdown (Q/s) — measure of well productivity and aquifer transmissivity
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Specific capacity = discharge (Q) / drawdown (s). Units: m³/day/m or L/min/m (drawdown). Higher specific capacity = more productive well. It is not constant (decreases as pumping rate increases due to non-linear well losses). Used to compare wells in the same aquifer and to assess aquifer productivity. From pumping test data: plot Q vs s.
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