Well Drawdown Calculator

Calculate well drawdown using the Theis/Cooper-Jacob equation from pump rate, transmissivity, storage coefficient, time, and distance.

Pump Rate Q (m³/day)

Transmissivity T (m²/day)

Storage Coefficient S

Pumping Time (days)

Distance from Well (m)

Tab to move between fields

Drawdown

0.215 m

Radius of Influence

1,500 m

Calculation MethodCooper-Jacob

Specific Capacity2,320.19 m³/day/m

u Parameter0

How to Use This Calculator

Enter the Pump Rate Q in m³/day and the Aquifer Transmissivity T in m²/day.
Enter the Storage Coefficient S and the Pumping Time in days.
Enter the Distance from the well in meters at which you want to calculate drawdown.
Review Drawdown in meters — the drop in water level at the specified distance.
Check Radius of Influence and Specific Capacity to characterize well performance and aquifer properties.

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Formula

s = (Q / 4πT) × W(u), where u = r²S / 4Tt

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