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Baid low lying, narrow winding valley, ridged
by relatively high topography.
This type of topography, locally called chala,
is commonly seen in the dhaka,
gazipur,
tangail,
mymensingh
and jamalpur
red soil areas (ie within the madhupur
tract). The valleys are believed to be the remnants of the
past estuarine tidal
channels when the area had a estuarine environment during the
Pleistocene period (about 0.8-1 million years ago). As the sea
receded south and the area became uplifted, the baids lost connection
with their parent channels, thus becoming inoperative. In most cases,
the baids become well connected with the parent channels during
the monsoon
when they receive a flow from outside and act as local drainage
outlets as well as a sink for the washed out eroded soil
of the adjoining chalas. In the dry season
it is primarily used for boro rice cultivation. The soils of the baids
are mostly silt-clay to clay
and rich in organic matter.
[Mohd Shamsul Alam] |
