Central Ground Water Board

Ministry of Water Resources
Government of India

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State Profile

State Profile
Ground Water Scenario of Assam

Area (Sq.km)

78,438

Physiography

  • Brahmaputra Valley.
  • The Central Assam Ranges.  
  • Barak Valley.   

Drainage

Brahmaputra Basin with sub basin of
Subansiri, Jia Bharali, Badeng-Pubnoi, Dhansiri, Manas, Champamati Kalang.
Meghna Basin with sub basin of Barak river

Rainfall

2262.95 mm with 144 rainy days

Total Districts / Blocks

23 districts / 219 Blocks

Hydrogeology

Hydrogeologically the state can be divided into three units namely consolidated formation, semi consolidated formation and unconsolidated formation. More than 75% of the state is underlain by unconsolidated formation comprising of clay, silt, sand, gravel, pebble and boulders. The Bhabar belt is about 11 to 15 km wide; the tubewells yield 27 to 59 m3/hr in this zone. The Tarai zone follows immediately down slope of the Bhabar zone where the yield of the wells ranges between 80-240 m3/hr. The flood plains follow the Tarai in Brahmaputra valley where the shallow tubewells yield between 20-50 m3/hr and deep tubewells between 150-240 m3/hr. In the semi consolidated formations of Cachar district, the yield of the tubewell ranges between 50 to 100 m3/hr.

 

Dynamic Ground Water Resources

Annual Replenishable Ground water Resource

27.23 BCM

Net Annual Ground Water Availability

24.89 BCM

Annual Ground Water Draft

5.44 BCM

Stage of Ground Water Development

22 %

Ground Water Development & Management

Over Exploited

NIL

Critical

NIL

Semi- critical

NIL

Artificial Recharge to Ground Water (AR)

  • Feasible AR structures:

250 Check Dams, 500 weirs, 1000 Gabion structures, 250 development of springs 600 RWH in Urban Areas

 Ground Water Quality Problems

Contaminants

Districts affected (in part)

Fluoride (>1.5 mg/l)

Goalpapra, Kamrup, Karbi Anglong, Nagaon,

Iron (>1.0 mg/l)

Cachar, Darrang, Dhemaji, Dhubri, Goalpapra, Golaghat, Hailakandi, Jorhat, Kamrup, Karbi Anglong, Karimganj, Kokrajhar, Lakhimpur, Morigaon, Nagaon, Nalbari, Sibsagar, Sonitpur

Arsenic (>0.05 mg/l )

Dhemaji

Enactment of Ground Water Bill to regulate and control the development of ground water:
 
“The Assam Ground Water Bill” has been prepared by the Government of Assam to regulate and control the development of ground water, which has been referred to Law Department for vetting. Necessary action is being taken for finalization.

Inclusion of Roof Top Rain Water Harvesting (RTRWH) in building by laws:

To be included.

 

Central Ground Water Authority

Areas Notified for Regulation of ground water development

NIL

Mass Awareness Programme (as on 31.03.2010)

14

Water Management Training Programme (as on 31.03.2010)

10

 
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