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State Profile
State Profile
Ground Water Scenario of Karnataka
Area (Sq.km) |
1,91,791 |
Rainfall (mm) |
1779 |
Total Districts / Talukas |
27 districts / 175 Talukas |
Hydrogeology
The state is covered by peninsular gneisses, granites, schists, & basalts along with sedimentaries of Kaldagi and Bhima groups. The recent alluvium is restricted to coastal areas and stream courses. The water bearing and yield characteristics in hard rock are primarily controlled by the extent of weathering and fracturing. In limestone areas, solution cavities impart secondary porosity. The yield of tube wells tapping hard rocks is as high as 50 m3/hr. The tube wells in sedimentaries can yield up to 15 m3/hr.
Dynamic Ground Water Resources |
Annual Replenishable Ground water Resource |
15.93 BCM |
Net Annual Ground Water Availability |
15.30 BCM |
Annual Ground Water Draft |
10.71 BCM |
Stage of Ground Water Development |
70 % |
Ground Water Development & Management |
Over Exploited |
65 Talukas |
Critical |
3 Talukas |
Semi- critical |
14 Talukas |
Ground Water User Maps |
27 districts |
Artificial Recharge to Ground Water (AR) |
- Area identified for AR: 36710 sq km
- Quantity of Surface Water to be Recharged: 2065 MCM
- Feasible AR structures: 1040 sub surface dams, 5160 percolation tanks/ desilting of old tanks, 17182 check dams, 8.3 lakh RTRWH with filter bed.
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AR schemes completed during VIII Plan :2
AR schemes completed during IX Plan: 2 |
Ground Water Quality Problems |
Contaminants |
Districts affected (in part) |
Salinity (EC > 3000 µS/cm at 25 ° C) |
Bagalkot, Belgaun, Bellary, Davangiri,Gadag, Gulburga, Raichur |
Fluoride (>1.5 mg/l) |
Bagalkot, Bangalore, Belgaun, Bellary, Bidar, Bijapur, Chamarajanagara, Chikmagalur, Chitradurga, Davanagere, Dharwad, Gadag, Gulburga, Haveri, Kolar, Koppala, Mandya, Mysore, Raichur, Tumkur |
Chloride (> 1000 mg/l) |
Bagalkot, Belgaum, Gadag, Dharwar |
Iron (>1.0 mg/l) |
Bagalkot, Bangalore, Belgaum, Bellary, Bidar, Bijapur, Chikmagalur, Chitradurga, Dakshina Kannada, Davanagere, Gulburga, Hasan, Haveri, Kodagu, Kolar, Koppala, Mysore, Raichur, Shimoga, Tumkur, Udupi, Uttar Kannada |
Nitrate (>45 mg/l) |
Bagalkot, , Bangalore, Belgaum, Bellary, Bidar, Bijapur, Chamarajanagara, Chikmagalur, Chitradurga, Davanagere, Dharwad, Gadag, Gulburga, Hassan, Haveri, Kodagu, Kolar, Koppala, Mandya, Mysore, Raichur. Shimoga, Udupi, Uttar Kannada |
Enactment of Ground Water Bill to regulate and control the development of ground water:
The State Cabinet has approved the “Karnataka Ground Water (Regulation and Control of Development and Management) Bill, 2007. To be enacted.
Inclusion of Roof Top Rain Water Harvesting (RTRWH) in building by laws:
The State has adopted a RWH policy to mandate this in all new construction. Bangalore City Corporation has already incorporated mandatory RWH in Building Bye-laws. Other ULB’s are being encouraged to do so. Action to amend building bye-laws in major cities having population of more than 20 lakh to make RWH mandatory has been initiated. Rural Development & Panchayati Raj Department has issued orders for implementation of roof top RWH in all Government buildings and also in rural schools. State has also extended help to the individual people also to the tune of 20% rebate on tax payment for 5 years duration.
Central Ground Water Authority
Areas Notified for Regulation of ground water development |
NIL |
Mass Awareness Programme (as on 31.03.2010) |
19 |
Water Management Training Programme (as on 31.03.2010) |
16 |
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Ministry
of Water Resources