False-this is false, although a cone of depression is an actual hydrologic term. in a different sense, this is true, remembering how my young daughter complained when her ice cream fell off her cone onto the pavement once.
all pumped wells, to varying degrees, cause cones of depressions to form around the well casing at the water-table (the altitude, below ground, where below it the ground is saturated with water). if large cones of depressions form then the level of the water table can decline below the depth of the water intake for the well, and the well will pump less water and possibly go dry. if this happens, it will take time for the aquifer to recharge enough to raise the water level back to previous levels. that is why it is important to study the recharge characteristics of the aquifer that is tapped by a wellthe well operator should not pump a well faster than it is recharged, as a cone of depression could form.