CENTRAL GROUND WATER BOARD

7,096

Rainfall (mm)

3494

Total Districts / Blocks

4 Districts  

Dynamic Ground Water Resources (2011)

Annual Replenishable Ground water Resource

--- BCM

Net Annual Ground Water Availability

0.044 BCM

Annual Ground Water Draft

0.011 BCM

Stage of Ground Water Development

26%

Ground Water Development & Management

Over Exploited

NIL

Critical

NIL

Semi- critical

NIL

Artificial Recharge to Ground Water (AR)

• Areas identified for AR: 500 sq km
• Volume of water to be harnessed: 91 MCM

• Volume of water to be harnessed through RTRWH: 186 MCM

• Feasible AR structures:

1. Spring development – 1400
2. Gabion/check dam/Nala bund – 180
3. Cement plug/sub surface dyke – 325
4. RTRWH (H) – 4750
5. RTRWH (G& I) - 250

Ground Water Quality Problems

Contaminants

Districts affected (in part)

Salinity  (EC > 3000 µS/cm at 25 ° C)

In Sikkim, there is no ground water abstraction structure. During aquifer mapping work, water samples were collected from springs and none of the constituents (as provided) exceeds the limit.

Fluoride (>1.5 mg/l)

Iron (>1.0 mg/l)

Nitrate  (>45 mg/l)

Arsenic(above 0.05 mg/l)

Heavy metals:
Lead (above 0.01 mg/l)
Cadmium (above 0.003 mg/l)
Chromium (above 0.05 mg/l)

NIL