25 June:Central Ground water Board (CGWB) measures Ground Water levels four times a year all over the country during January, April/May, August and November through a network of about 15000 observation wells.
This important data is used to assess ground water resources and changes in the regime consequent to various development and management activities. A World Bank aided Hydrology Project was sanctioned under the Ministry of Water Resources in 1997 to strengthen the ground water monitoring network and measuring capabilities. This project was implemented with the coordination and participation of 9 southern states.
Under this project 2239 purpose built peizometers have been constructed to strengthen the existing ground water monitoring network and 1200 digital water level recorders have been installed at select wells to acquire high frequency water level data so as to monitor short term ground water regime changes. Ground water samples are collected through these observation wells once a year during the month of April/ May to create background information of ground water quality changes on regional scale.