This book focuses on natural and manmade structures which are used for drawing groundwater to the surface. Groundwater extraction structures include open dug wells (small-diameter open wells and large-diameter irrigation wells), tube wells, filter point wells, bore wells, surangams, and dug-cum-bore wells. Early abstraction structures were mainly natural but more manmade structures are now in use due to technological developments. Upto 30% of the freshwater supply in the world comes from groundwater, and among freshwater resources, groundwater plays a crucial role in the drinking water...