Answer
Drawdown refers to the lowering of the water table or piezometric surface in an aquifer caused by the extraction of groundwater from a well or other water source. When groundwater is pumped from a well, the water level around the well drops, creating a cone-shaped depression in the water table. This cone of depression is known as the "cone of depression." The drawdown is the difference in water level between the original water table and the lowered water level within the cone of depression.
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