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      Question

      "Vertical Drainage"

      involves:
      A Building tall pipes Correct Answer Incorrect Answer
      B Pumping groundwater to lower the water table Correct Answer Incorrect Answer
      C Digging deep trenches Correct Answer Incorrect Answer
      D Growing tall trees Correct Answer Incorrect Answer

      Solution

      By pumping from wells, the water table is lowered vertically, which is often more cost-effective than laying kilometers of horizontal tiles.

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