Central Ground Water Board, Ministry of Water Resources, Government of India

Ground Water is a Precious National Resource - Preserve it, Protect it and Don't Pollute it.

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	2409 mm( Average annual)
Total Districts / Blocks	27 Districts

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 (2011)
Annual Replenishable Ground water Resource		28.52 BCM
Net Annual Ground Water Availability		25.79 BCM
Annual Ground Water Draft		3.49 BCM
Stage of Ground Water Development		14 %
Ground Water Development & Management
Over Exploited		NIL
Critical		NIL
Semi- critical		NIL
Artificial Recharge to Ground Water (AR)		Feasible AR structures Check dam-250 Weirs-500 Gabion structure-1000 RTRWH-600 Development of springs-250
Ground Water Quality Problems
Contaminants	Districts affected (in part)
Fluoride (>1.5 mg/l)	Goalpara, Kamrup, KarbiAnglong, Naugaon, Golaghat, Karimganj
Iron (>1.0 mg/l)	Cachar, Darrang, Dhemaji, Dhubri, Goalpara, Golaghat, Hailakandi, Jorhat, Kamrup, KarbiAnglong, Karimganj, Kokrajhar, Lakhimpur, Morigaon, Nagaon, Nalbari, Sibsagar, Sonitpur, Bongaigoan, Dibrugarh.
Arsenic (above 0.05 mg/l)	Sivsagar, Jorhat, Golaghat, Sonitpur, Lakhimpur, Dhemaji, Hailakandi, Karimganj, Cachar, Barpeta, Bongaigaon, Goalpara, Dhubri, Nalbari, Nagaon, Morigaon, Darrang&Baksha

Central Ground Water Authority

Areas Notified for Regulation of ground water development

NIL

CENTRAL GROUND WATER BOARD