About two third of West Bengal is covered by alluvial deposits of Sub-Recent to Recent time while the remainder by a wide variety of hard rocks where water scarcity is prevalent. Hydrogeologically fissured and fractured hard rocks predominate in the Peninsular and extra peninsular areas while Quaternary arenaceous formations underlie the plains. Groundwater development in hard rocks is possible through construction of dug well, dug-cum-bore wells as also bore wells. Springs form major source of water in the hilly and mountainous tract and losing sustainability due to climatic change. In spite of prolific resource potential of the vast alluvial aquifer, great deal of anomalies in ground water potential and qualities are noticed. Shallow alluvial aquifers are under extensive exploitation but high incidence of Arsenic in ground water (above permissible limit of 0.01 mg/l) within 100 metre below ground level (mbgl) has been reported from 104 blocks of 10 districts in West Bengal. Fluoride contamination is also prevalent in parts of hard rock areas as also alluvial Barind tract. In the Coastal areas, fresh water bearing aquifers are occurring at places within 120m underlain by saline aquifers while in major parts it is sandwiched by saline aquifers and delineated within 140-360 mbgl. Several issues related to groundwater and management are discussed in the paper.
Groundwater Resources Potential and its Management Strategies in West Bengal
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About two third of West Bengal is covered by alluvial deposits of Sub-Recent to Recent time while the remainder by a wide variety of hard rocks where water scarcity is prevalent. Hydrogeologically fissured and fractured hard rocks predominate in the Peninsular and extra peninsular areas while Quaternary arenaceous formations underlie the plains. Groundwater development in hard rocks is possible through construction of dug well, dug-cum-bore wells as also bore wells. Springs form major source of water in the hilly and mountainous tract and losing sustainability due to climatic change. In spite of prolific resource potential of the vast alluvial aquifer, great deal of anomalies in ground water potential and qualities are noticed. Shallow alluvial aquifers are under extensive exploitation but high incidence of Arsenic in ground water (above permissible limit of 0.01 mg/l) within 100 metre below ground level (mbgl) has been reported from 104 blocks of 10 districts in West Bengal. Fluoride contamination is also prevalent in parts of hard rock areas as also alluvial Barind tract. In the Coastal areas, fresh water bearing aquifers are occurring at places within 120m underlain by saline aquifers while in major parts it is sandwiched by saline aquifers and delineated within 140-360 mbgl. Several issues related to groundwater and management are discussed in the paper.
Publication Mode |
Online |
---|---|
Publication Author |
Amlanjyoti Kar |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2021 |
DOI |
10.17491/cgsi/2021/165850 |
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