A well produces 121 gpm. If the drawdown for the well is 13.8 ft, what is the specific yield in gpm/ft?

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Multiple Choice

A well produces 121 gpm. If the drawdown for the well is 13.8 ft, what is the specific yield in gpm/ft?

Explanation:
Specific capacity is the discharge per unit of drawdown, expressed as gpm per foot. It shows how productive a well is for each foot the water level drops during pumping. To find it, divide the pumping rate by the drawdown: 121 gpm ÷ 13.8 ft ≈ 8.77 gpm/ft. This means the well delivers about 8.77 gallons per minute for every foot of drawdown. Higher values indicate a more productive well with less drop per unit flow; actual performance depends on aquifer properties, pumping duration, and well design.

Specific capacity is the discharge per unit of drawdown, expressed as gpm per foot. It shows how productive a well is for each foot the water level drops during pumping. To find it, divide the pumping rate by the drawdown: 121 gpm ÷ 13.8 ft ≈ 8.77 gpm/ft. This means the well delivers about 8.77 gallons per minute for every foot of drawdown. Higher values indicate a more productive well with less drop per unit flow; actual performance depends on aquifer properties, pumping duration, and well design.

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