The primary objective of ground water regime monitoring is to record information on ground water level and quality through representative sampling in space and time. Board regularly monitors ground water level through a wide network of ground water observation wells located all over the Country. Water level is measured four times in a year i.e., in the month of January, April/May, August and November and ground water quality samples are collected once in a year i.e., during April/May.
Ground Water Level Scenario in India during November’2016
The ground water level data for November 2016 indicates that out of the total 15566 wells analysed, 2622(17%) wells are showing water level less than 2 m bgl (metres below ground level), 5933(38%) wells are showing water level in the depth range of 2-5 m bgl, 4175 (27 %) wells are showing water level in the depth range of 5-10 m bgl, 1898 (12%) wells are showing water level in the depth range of 10-20 m bgl, 718(5%) wells are showing water level in the depth range of 20-40 m bgl and the remaining 220 (1 %) wells are showing water level more than 40 m bgl. The maximum depth to water level of 122.00 m bgl is observed in Bikaner district of Rajasthan whereas the minimum is less than 1 m bgl.
In general depth to water level ranges from 2 to 10 m bgl as observed at about 65% of the monitoring stations. In the states of Uttar Pradesh, Bihar, Odisha, Chhatishgarh, Assam, Jharkhand, West Bengal and Maharashtra, generally the depth to water level varies from 2-5 meter below ground level. Shallow water level of less than 2 m bgl is observed in the states of Assam, Odisha, Andhra Pradesh, Maharashtra, Rajasthan and Uttar Pradesh and isolated pockets in Chhatishgarh, Jharkhand and Madhya Pradesh. In major parts of north-western states depth to water level generally ranges from 10-40 m bgl. In the western parts of the country deeper water level is recorded in the depth range of 20-40 m bgl and more than 40 m bgl. In some parts of Haryana, and Delhi and almost major parts of Rajasthan, water level of more than 40 m bgl is recorded. Along the eastern & western coast water level is generally upto 10 mbgl. Central part of West Bengal recorded water level in the range of 5-20 m bgl. In Central India water level generally varies between 2 m bgl to 10 m bgl, except in isolated pockets where water level more than 10 m bgl has been observed.