CENTRAL GROUND WATER BOARD
State Profile
Ground Water Scenario of Bihar
Area (Sq.km) |
94,163 |
Rainfall (mm) |
1030 mm |
Total Districts / Blocks |
38 Districts |
Hydrogeology
Hydrogeologically, the various litho-units of the State can be grouped as unconsolidated / Alluvial formation, semi-consolidated formations and consolidated/fissured formations. The main alluvial tract covers entire north Bihar and a sizeable area south of the Ganga River. These alluvial formations constitute prolific aquifers where the tubewell can yield between 120-247 m3/hr. The potentiality of these aquifer decreases due south in the marginal tract. Auto flow conditions occur in the sub-Tarai region of Madhubani, Sitamarhi and West Champaran Districts. In the hard rock areas of South Bihar, borewells located near lineaments/fractures can yield between 10-50 m3/hr.
Dynamic Ground Water Resources (2011) |
|
Annual Replenishable Ground water Resource |
29.34 BCM |
Net Annual Ground Water Availability |
26.88 BCM |
Annual Ground Water Draft |
11.95 BCM |
Stage of Ground Water Development |
44 % |
Ground Water Development & Management |
|
Over Exploited |
NIL |
Critical |
NIL |
Semi- critical |
11 |
Artificial Recharge to Ground Water (AR) |
|
Ground Water Quality Problems |
|
Contaminants |
Districts affected (in part) |
Fluoride (>1.5 mg/l) |
Aurangabad, Banka, Bhagalpur, Buxar, Gaya, Jamui, Kaimur( Bhabua), Munger, Nawada, Rohtas, Supaul |
Iron (>1.0 mg/l) |
Aurangabad, Begusarai, Bhojpur, Buxar, East Champaran, Gopalganj, Katihar, Khagaria, Kishanganj, Lakhiserai, Madhepura, Muzaffarpur, Nawada, Rohtas, Saharsa, Samastipur, Siwan, Supaul, West Champaran |
Nitrate (>45 mg/l) |
Aurangabad, Banka, Bhagalpur, Bhojpur, Darbhanga, Kaimur(Bhabua), Patna, Rohtas, Saran, Siwan |
Arsenic (>0.05 mg/l ) |
Begusarai, Bhagalpur, Bhojpur, Buxar, Darbhanga, Katihar, Khagaria, Kishanganj, Lakhisarai, Munger, Patna, Purnea, Samastipur, Saran, Vaishali |
Central Ground Water Authority
Areas Notified for Regulation of ground water development |
one |