Ground Water Monitoring

Ground water levels are being measured four times a year during January, April/ May, August and November by Central Ground Water Board through a network of about 15000 observation wells located all over the country. This data is used for assessment of ground water resources and changes in the regime consequent to various development and management activities. For strengthening of ground water monitoring network and measuring capabilities, a World Bank aided Hydrology Project was sanctioned in 1997 under the Ministry of Water Resources. The project was implemented with the coordination and participation of 9 Southern States. Under the project, 2239 purpose built piezometers have been constructed to strengthen the existing ground water monitoring network.and1200 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. The State wise observation wells are given below:-

State-Wise Observation Wells (As on 31.03.2009)

Sr. No.	Region/States	Total No. of NHNS
	States
1	Andhra Pradesh	981
2	Arunachal Pradesh	19
3	Assam	381
4	Bihar	373
5	Chhattisgarh	516
6	Delhi	87
7	Gujarat	966
8	Goa	53
9	Haryana	426
10	Himachal Pradesh	85
11	Jammu and Kashmir	206
12	Jharkhand	208
13	Karnataka	1499
14	Kerala	864
15	Madhya Pradesh	1325
16	Maharashtra	1496
17	Manipur	25
18	Meghalaya	38
19	Nagaland	17
20	Orissa	1214
21	Punjab	261
22	Rajasthan	1373
23	Tamil Nadu	906
24	Tripura	42
25	Uttar Pradesh	1218
26	Uttaranchal	44
27	West Bengal	909
	Union Territories
1	Andaman & Nicobar	63
2	Chandigarh	16
3	Dadra & NAgar HAveli	10
4	Daman & Diu	4
5	Pondicherry	15
	Grand Total	15,640

The Monitoring of water level and water quality is being carried out by CGWB since 1969.
Water Level measurements are regularly taken four times a year and water quality sampling is done once a year.
Bulletins containing data of each measurement are issued periodically. An year book comprising all the data of water level and water quality is also issued every year.

Geround Water Year Book 2007

Developed by NIC, New Delhi and National Data Center, CGWB, Faridabad
email: cgwb@nic.in Tel: +91-129-2419106 Fax: 91-129-2412524

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Ground Water Monitoring

The Monitoring of water level and water quality is being carried out by CGWB since 1969.

Water Level measurements are regularly taken four times a year and water quality sampling is done once a year.

Bulletins containing data of each measurement are issued periodically. An year book comprising all the data of water level and water quality is also issued every year.