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State Profile
State Profile
Ground Water Scenario of West Bengal
Area (Sq.km) |
88,752 |
Rainfall (mm) |
2074 |
Total Districts / Blocks |
18 districts / 341 Blocks |
Hydrogeology
The state can be divided into two hydrogeological unit namely fissured hard rocks & porous alluvial formations. Fissured formation includes crystalline, metasedimentary and volcanic rocks. The yield of wells tapping fractured zones varies from 10-20 m3/hr. Two third of the State is underlain by alluvial sediments mainly deposited by Ganga & Brahmaputra rivers. Based on the yield of wells tapping these alluvial sediments, aquifers of the alluvial area can be divided into three zones. 1. Yielding about 150m3/hr, occurs from Jalpaiguri to Kochbihar in north to Medinipur & 24 Parganas in South. 2. Yielding about 50-150 m3/hr, occurs in parts of Malda, Dinanjpur and western part of Murshidabad districts. 3. Yielding less than 50m3/hr, occurs as Marginal alluvial tract in parts of Birbhum, Burdawan, Bankura and Murshidabad districts.
Dynamic Ground Water Resources |
Annual Replenishable Ground water Resource |
30.36 BCM |
Net Annual Ground Water Availability |
27.46 BCM |
Annual Ground Water Draft |
11.65 BCM |
Stage of Ground Water Development |
42 % |
Ground Water Development & Management |
Over Exploited |
NIL |
Critical |
1 Block |
Semi- critical |
37 Blocks |
Ground Water User Maps |
18 districts |
Artificial Recharge to Ground Water (AR) |
- Area identified for AR: 7500 sq km
- Quantity of Surface Water to be Recharged: 2664 MCM
- Feasible AR structures: 11200 percolation tanks with shafts, 3606 gabion structures, 1054 nala bund/ cement plug, 1680 re excavation of tanks, 500 desiltation of village pond, 1000 spring development, 70 sub surface dykes, 1500 RTRWH for Kolkata & Darjeeling.
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AR schemes completed during VIII Plan: 2
AR schemes completed during IX Plan: 5 |
Ground Water Quality Problems |
Contaminants |
Districts affected (in part) |
Salinity (EC > 3000 µS/cm at 25 ° C) |
Haora, Medinipur, S- 24 Parganas, |
Fluoride (>1.5 mg/l) |
Bankura, Bardhaman, Birbhum, Dakhindinajpur, Malda, Nadia, Purulia, Uttardinajpur |
Chloride (> 1000 mg/l) |
S-24 Parganas, Haora |
Iron (>1.0 mg/l) |
Bankura, Bardhaman, Birbhum, Dakhindinajpur, E. Midnapur, Howrah, Hugli, Jalpaiguri, Kolkatta, Murshidabad, N-24praganna, Nadia, S-24pragannas, Uttardinajpur, West Midnapur |
Nitrate (>45 mg/l) |
Bankura, Bardhaman |
Arsenic (>0.05 mg/l ) |
Bardhaman, Hooghly, Howrah, Malda, Murshidabad, Nadia, North 24 Praganas, South 24 Pragannas |
Enactment of Ground Water Bill to regulate and control the development of ground water:
“West Bengal Ground Water Resources (Management, Control and Regulation) Act, 2005 came into effect on 15.09.2005. Rules under the Act have also been framed by the State Govt.
Inclusion of Roof Top Rain Water Harvesting (RTRWH) in building by laws:
Vide Rule 171 of the West Bengal Municipal (Building) Rules, 2007, installation of RWH system has been made mandatory.
Central Ground Water Authority
Areas Notified for Regulation of ground water development |
- Haldia Municipal area Medinipur District
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Mass Awareness Programme (as on 31.03.2009) |
22 |
Water Management Training Programme (as on 31.03.2010) |
17 |
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Ministry
of Water Resources