Groundwater is an important natural source
of water supply throughout the world. It is precious and
most widely distributed resource. The use of
groundwater is increasing day by day in irrigation,
domestic water supply, municipalities, rural areas, and
industries. It gets its replenishment from precipitation,
surface flow and reserves. Now a day’s large scale
abstraction results in lowering of groundwater level is a
serious threat to future groundwater irrigation
development. Bangladesh is no more exception to the
deteriorating condition of the water resources systems.
So, a detailed study is needed to identify the subsurface
formations. One of the most important aspects for
groundwater investigation program is the knowledge
about the underlying formations. It gives a clear picture
of the information needed, such as, the probable
aquifer, its location, thickness, composition, etc.
In this research, the lithological borehole data of
467 locations have been collected, compiled, processed,
analyzed and interpreted for studying the hydro-
geological properties of 18 upazillas of the study area.
Borehole log is one such method that furnishes
information on substrata in vertical line from the
surface. These furnish a description of the geologic
character and thickness of each stratum encountered as
a function of depth, thereby enabling aquifers to be
determined. Shaded contour maps of clay, fine sand and
composite sand thickness have been presented for
qualitative study of groundwater potentiality of the
area. Yield potential index map of the water saturated
zone selects the suitable potential zone and hence
identifies the proper location of well-sites. Stratigraphic
and cross-sectional views in various orientations are
prepared to visualize the subsurface of the study area.
Stratigraphy influences the formation and distribution
of groundwater. It studies the surface feature of the
area and plays an important role in selecting the well
sites. The availability and abundance of groundwater at
different places are influenced by the stratigraphic
Keywords : Stratigraphy; Uncofined Layer; Fence Diaram; Groundwater Exploration; Abstraction.