Application of Electrical Resistivity and Induced Polarisation Methods a for Detection of Fluoride Contaminated Groundwater

State Water Investigation Directorate (SWID), Government of West Bengal had drilled several boreholes in the Nalhati-Nashipur area (87°42' E to 87°54' E longitude and 24°15' N to 24°26' N latitude) in the district of Birbhum for development of potable ground water in the region. Quaternary sedments overlying the Rajmahal Trap, including the weathered/vesicular traps form the potential aquifers in these areas. Ground water samples from deeper aquifers at a few locations show high fluoride concentration in the area.

Resistivity and Induced Potarisation survey have been carried out in the area to demarcate the zones where contaminated ground water may exist. This paper aims to highlight the utility of the above surveys, using chemical analysis of data as constraints, in successful delineation of such contaminated /polluted ground water zones. In order to check the spread of Osteo-Fluorosis in the region ground water from such areas may be avoided for drinking purpose.