CENTRAL GROUND WATER BOARD
State Profile
Ground Water Scenario of Meghalaya
Area (Sq.km) |
22,429 |
Physiography |
Mainly four physiographic units
|
Drainage |
State is drained by mainly rivers and tributaries of Brahmaputra, Meghna basins |
Rainfall (mm) |
3290( Average annual) |
Total Districts / Blocks |
7 Districts |
Hydrogeology
The northern part of the State is covered by consolidated formations comprising granites, gneisses, schists, quartzites, phyllites and Conglomerates with basic and acid intrusives. The zone of weathering is the main repository of ground water, however, the weak planes, fissure, joints and fractures also hold substantial quantity of ground water. Semi-consolidated sandstones with other sedimentary formations cover the entire south western and south eastern part of the State in Khasi and Jaintia hills District. The tubewells in the sedimentary formations in valleys yield 25-50 m3/hr. Unconsolidated formations are restricted to a narrow belt in the extreme north western fringe where hills rolls down to Assam and Bangladesh plains. The deep tube wells in these alluvial formations can yield between 54 to 110 m3/hr. Shallow Tube wells in river fills in Garo hills District yield between 25 & 40 m3/hr. Ground water in the State is characterized by low salinity.
Dynamic Ground Water Resources (2011) |
|
Annual Replenishable Ground water Resource |
1.78 BCM |
Net Annual Ground Water Availability |
1.60 BCM |
Annual Ground Water Draft |
0.0017 BCM |
Stage of Ground Water Development |
0.1 |
Ground Water Development & Management |
|
Over Exploited |
NIL |
Critical |
NIL |
Semi- critical |
NIL |
Artificial Recharge to Ground Water (AR)
|
|
Ground Water Quality Problems |
|
Contaminants |
Districts affected (in part) |
Iron (>1.0 mg/l) |
East Garo Hills, East Khasi Hills, Jaintia Hills, West Khasi hills, Ri Bhoi |
Central Ground Water Authority
Areas Notified for Regulation of ground water development |
NIL |