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Karnataka: Groundwater level dips, water has chemicals


Karnataka: Groundwater level dips, water has chemicals
Chemical content in ground water was beyond BIS norms in Bengaluru district. (Representational image)

Bengaluru: The latest report of the Central Ground Water Board says ground water level has declined in most states in the period between the pre- monsoon months of 2015 and the pre-monsoon months this year.

Also, the water has more chemical content than permissible. Referring to Karnataka, the report that was released recently, says it  has very shallow ground water in about 5 per cent of the wells monitored.

In general, the water level is in the range of 2-20 m BGL in almost 93  per cent of the wells monitored.

Depth to water level of 2-5 m BGL was seen in 21 per cent of the monitored wells, and, 45 per cent wells showed water levels of 5-10 m BGL. Deeper water level of more than 10 m BGL was seen in  28 per cent wells

In Bengaluru district, the ground water was between 5-10 BGL, showing a decline since the 2015 pre-monsoon period. The reports says there was rise in water level in about 21 per cent of the wells and a fall in about 72 per cent.

Chemical content in ground water was beyond BIS norms in Bengaluru district.  It had above 1.5 mg/l fluoride, over 45 mg/l nitrate content and over 1.0mg/l iron.

Fluctuation in Water-level

  • 15 per cent of the wells  showed a rise in water level in the 0-2 m range, and 3 per cent a rise in the 2-4 m range between  pre-monsoon 2016 and pre-monsoon 2015
  • 45 per cent of the wells showed a fall in the range of 0 – 2 m, and 15 per cent a decline in the range of 2-4 m range

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