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Authors
Affiliations
1 Department of Geological Sciences, Jahangirnagar University, Savar, Dhaka-1342, BD
2 Grant Geophysical Inc., Party No. 432, Chittagong, BD
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 2 (2000), Pagination: 161-168
Abstract
The available geophysical well logs from the eastern part of Dhaka City have been interpreted to ascertain aquifer properties and to infer groundwater quality. From the interpretation of geophysical logs and study of the borelogs, the subsurface materials of the area could be divided into three litho-units; the upper and lower clay units, and the middle sand unit, i.e., the aquifer. These units appear to be characterized by contrasting physical properties and in particular, the resistivity. The anisotropy in electrical resistivity of the layered formation has also been examined. While the clay units are practically isotropic, the sand unit seems to be anisotropic and that may be principally related to variation in lithology. The percentage volume of shale, porosity, specific yield, and specific retention of the aquifer have been evaluated. The water quality parameters reveal complete potability of the groundwater.
Keywords
Hydrogeology, Groundwater, Geophysical Well Logs, Coefficient of Anisotropy, Aquifer Parameters, Dhaka City, Bangladesh.
