Geological and Hydrological Setting of the Study Area
DEPZ, located at about 35 km south-east of Dhaka, the capital city of Bangladesh, was selected as
the study area in the present research work. This area belongs to Dhamsona Union under Savar
Upazila of Dhaka District. The area is situated at the southwestern fringe of a Pleistocene terrace
named the Madhupur Tract, an elevated landscape distinct from the surrounding Fluvio-deltaic plains
by the Ganges, Brahmaputra and Meghna River. The major geomorphic units of the area are: the high
land, the low lands or floodplains, depressions, swamps, marshes and abandoned channels. Soil of the
Modhupur Formation, in general reddish brown in color, contains pre-existing paleosol materials.
Hydrology of the study area is governed by rainfall intensity and distribution, permanent or ephemeral
water bodies and rivers or canals. The average rainfall distribution pattern in various months shows a
distinct conformation with the climatic pattern prevailing, with strong Monsoon influence. The average
annual rainfall in dry and wet season in the area is about 25 and 380 mm, respectively. The
Bansi-Daleshwari and Turag River comprise the drainage network of the area-Bansi on the west and
Turag away on the east.