Borewells are drilled to tap water from the deeper confined aquifers. While drilling, a casing pipe is inserted to avoid caving in of the debris and weathered material. This casing pipe does not allow the water and material from the confined aquifer to enter into the borewell. The drilled borewell is fed with groundwater from the confined aquifers which is pumped out at much higher rate than its natural recharge rate. Hence borewells tend to provide lesser water with time and fail subsequently.