In a tube-well the yield will 

Explanation:

The yield of the tube well will increase with the increase in drawdown. Drawdown is the redaction in the piezometric head at a well in an aquifer due to pumping. the shape of the drawdown is an inverted cone.

Additional Information

Specific yield: 

• It is defined as the volume of water released from storage by an unconfined aquifer per unit surface area of aquifer per unit decline of the water table.

Specific Capacity: 

• It is defined as the rate of flow through the well per unit drawdown that has determined for initial first meter fall of water in well.

Specific storage: 

• It is the amount of water that a portion of an aquifer releases from storage, per unit mass or volume of aquifer, per unit change in hydraulic head, while remaining fully saturated.