Hydrogeology

Abstract

Hydrogeological study reveals that the area is characterised by more or less horizontal and continuous alternate layers of sand, clay, gravel and their mixture in various proportions. On the basis of interconnections, order of super-positions and nature of the layers as well as geophysical properties, six deeper aquifer systems and one shallow aquifer system has been identified. The aquifers are separated by impervious clay layers and show different degrees of saline ingression from different directions. Analysis of the high frequency water level data reveals that the water level in the deep aquifer reflects the pumping drawdown of the nearby wells and tidal effect. Long-term trend analysed groundwater level data indicate a fall in pre-monsoon water level. Scientific methods should be adopted in construction of the water-wells for the success of the well as well as for the protection of the aquifers.