Hyderabad, July 19: Scientists at Indo-French centre for groundwater research at the National Geophysical Research Institute (GRI) here have discovered that cyclic changes in the water table are caused by "earth tides" rather than ground water pumping. So, if the output of your bore-well water is fluctuating, do not blame it on excessive pumping by your neighbours. Blame it on gravity.

Earth tides are the result of elastic deformaton of the earth under the action of gravitational pull of the moon and the sun similar to the ocean tides that take place on the water surface due to the same gravitational pull.
The Indo-French team came to this conclusion after careful measurement of the water level in a 173-metre deep bore-well at NGRI campus using an electronic automatic water level recorder. Bureau Report