Central Ground Water Board

Ministry of Water Resources
Government of India

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State Profile

State Profile
Ground Water Scenario of Tamil Nadu

Area (Sq.km)

1,30,058

Rainfall (mm)

995

Total Districts / Blocks

30 distt. 384 Blocks

Hydrogeology

Nearly 73% of the total area of the State is occupied by a variety of hard & fissured crystalline rocks like charnockite, gneisses and granites. The depth of open wells varies from 6 to 30mbgl. While the depth of borewells generally varies from 30-100m. The sedimentary formations consist of sand stones, limestones and shales whereas Quaternary sediments in the State represented by Older alluvium and Recent alluvium and coastal sands. In the Cauvery delta of Thanjavur district, the artesian pressure head ranges between 4.5 m to 17 magl  with free  flow up to 270 m3/hr. The yield of wells in the alluvium varies form 27 to 212 m3/hr. The yield of wells in the fissured formations varies from 7 to 35 m3/hr.

Dynamic Ground Water Resources

Annual Replenishable Ground water Resource

23.07 BCM

Net Annual Ground Water Availability

20.76 BCM

Annual Ground Water Draft

17.65 BCM

Stage of Ground Water Development

85 %

Ground Water Development & Management

Over Exploited

142 Blocks

Critical

33 Blocks

Semi- critical

57 Blocks

Ground Water User Maps

29 districts

Artificial Recharge to Ground Water (AR)

  • Area identified for AR: 17292 sq km
  • Quantity of Surface Water to be     Recharged: 3597 MCM
  • Feasible AR structures: 8612 percolation tanks, 18170 check dams, 5 lakh rain water harvesting structure

AR schemes completed during VIII Plan: 3
AR schemes completed during IX Plan: 10

 

 

Ground Water Quality Problems

Contaminants

Districts affected (in part)

Salinity  (EC > 3000 µS/cm at 25 ° C)

Dharmapuri, Pudukkottai, Thoothukkudi, Coimbatore, Dindigul, Ramanathanpuram, Salem, Karur, Namakkal, Perambalor, Thiruvannamalai, Vellore, Villupuram, Cuddalore

Fluoride (>1.5 mg/l)

Coimbatore, Dharmapuri, Dindigul, Erode, Karur, Krishnagiri, Namakkal, Perambalor, Puddukotai, Ramanathanpuram, Salem, Sivaganga, Theni,   Thiruvannamalai, Trichurapally, Vellore, Virudhunagar

Chloride  (> 1000 mg/l)

Pudukkottai, Thoothukkudi, Ramanathanpuram, Namakkal, Cuddalore, Thirunamalai, Thanjavur, Shivaganga

Iron (>1.0 mg/l)

Namakkal, Salem,

Nitrate  (>45 mg/l)

Chennai, Coimbatore, Cuddalore, Dharmapuri, Dindigul, Erode, Kancheepuram, Kanyakumari, Karur, Madurai, Namakkal, Nilgiris, Perambalor, Puddukotai, Ramanathanpuram, Salem, Sivaganga, Theni,   Thiruvannamalai,Thanjavur,  Tirunelveli, Tiruvallur, Trichi, Tuticorin, Vellore, Villupuram, Virudhunagar

Enactment of Ground Water Bill to regulate and control the development of ground water: 

The State Government of Tamil Nadu has passed an Act “Tamil Nadu Ground Water (Development and Management) Act, 2003” on 04.03.2003 which includes provision of Tamil Nadu Ground Water Authority to regulate and control water development in the State of Tamil Nadu. Framing of rules and constitution of State Ground Water Authority is under consideration of State Govt. New provisions of the Model Bill, 2005 circulated by MoWR would be incorporated at appropriate time.

Inclusion of Roof Top Rain Water Harvesting (RTRWH) in building by laws:
Vide Ordinance No. 4 of 2003 dated July, 2003 laws relating to Municipal Corporations and Municipalities in the State have been amended making it mandatory for all the existing and new buildings to provide RWH facilities.
The State has launched implementation of RWH scheme on massive scale in Government buildings, private houses/Institutions and commercial buildings in urban & rural areas. The State Government has achieved cent percent coverage in roof top RWH.     

 

Central Ground Water Authority

Areas Notified for Regulation of ground water development

NIL

Mass Awareness Programme (as on 31.03.2010)

25

Water Management Training Programme (as on 31.03.2010)

18

 
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