What is the purpose of calculating total dynamic head (TDH) in selecting a well pump?

• A. TDH is the total head of the aquifer needed to push water into the well.
• B. TDH is the volume of water the well can yield per day.
• C. TDH is the maximum depth to which water can be pumped.
• D. TDH accounts for static head plus friction losses to determine the pump's required discharge capacity.

Answer: (D)