Geomorphologic Map of Greater Dhaka City, Bangladesh
90°15'0"E
90°20'0"E
90°25'0"E
90°30'0"E
90°35'0"E
Version 1
July 2014
24°0'0"N
24°0'0"N
Geological Survey of Bangladesh
Gazipur City Corporation
%
Technical support and
implemented by:
Islampur
%
±
AERE
%
%
National University
Pubail New Town
%
%
Kaliganj
National Monument
%
Ashulia
%
Tongi
%
k
Sita
lakh
ya R
iver
% BPATC
HSJI Airport
%
Purbachal New Town
23°50'0"N
23°50'0"N
%
%Bank Town
Rupganj
%
Mirpur Stadium
Bangsi
R
%
.
%
Modhumonti
Model Town
%
Old Airport
%
.
Balu R
Aftabnagar
Hazratpur
%
%
%
Bangabandhu
National Stadium
Kaltapara
% Demra
Buriganga R
Kanchpur Bridge
%
%
Keraniganj
Lineaments
%
Landmarks
RAJUK Jhilmil Project
%
Major Roads
Ruhitpur
%
23°40'0"N
23°40'0"N
River / Channel
Projection Information:
WGS 1984
Projection
: Transverse Mercator
False Easting
: 500000.000000
False Northing
: 0.000000
Central Meridian
: 0° N
Latitude of Origin
: 90° E
Scale Factor
: 0.9996
Unit
: Metres
%
Fatullah
Stadium
Mugrapara
%
Dh
ale
sw
ar i
R.
%
Narayanganj
City Corporation
Data Sources:
Aerial Photographs (1952-58), Sattelllite Images (Rapid Eye, Landsat, SPOT),
Survey of Bangladesh Topographic Sheet, 1:50 000 (1972 and 1979),
Sub-surface Investigation Borehole Data
Field Work Period:
1990 - 2013
Kilometers
Authors GSB:
A.T.M. Asaduzzaman, Nurun Nahar Faruqa, Mohammad Ashraful Kamal,
Mohammad Abdul Aziz Patwary, Sultana Nasrin Nury, Sarwat Jabeen
0 0,5 1
RF:
Authors BGR:
Rolf R. Ludwig, Rebecca Bahls, Andreas Günther
2
3
4
1:75.000
g
Me
Warning
This general Geomorphic Map serves as a base for the Urban Geology Map
for urban planning. Object planning and development needs further detail investigation.
hn
aR
ive
______________________________________________________
Issued by Geological Survey of Bangladesh, Director General
153 Pioneer Road, Segunbagicha, Dhaka-1000, Bangladesh
r
Phone: +880-2-9343141, +880-2-9361066, Fax: +880-2-9339309
E-mail: [email protected], Web site: www.gsb.gov.bd
90°15'0"E
90°20'0"E
90°25'0"E
90°30'0"E
90°35'0"E
LEGEND
Color
code
Unit Name
Madhupur Terrace (High)
Madhupur Terrace (Middle)
Madhupur Terrace (Low)
Narrow Valley / Gully
Broad Valley
High Floodplain
Low Floodplain
Marshy Land
Abandoned Channel
Oxbow Lake
Old Natural Levee
Younger Natural Levee
Pointbar Complex
Channelbar
Landform:
Top surface curvature, undulation, dissection, elevation
Flattened and low dissected part of Madhupur terrace, > 6.0m amsl
Rugged, highly dissected, individual hillocks in floodplain areas, 4.0 - 6.0m amsl
Flat, situated almost at floodplain level, 2.5 - 4.0m amsl
Sharp narrow valley or channel, 2.0 - 7.0m amsl
Elongated, wide valley mainly in Madhupur terrace area, 1.5 - 4.0m amsl
Generally flat, with some terraces, situated above annual flood level, 2.0 - 4.0m amsl
Flat, annually flooded and poorly drained land, 1.5 - 2.5m amsl
Deepest part of the floodplain area, mostly remains under water, 1.3 - 2.0m amsl
Former river, no water flow due to channel shifting, 1.3 - 2.0m amsl
Meander cutoff, crescent-shaped lake, <2.0m amsl
Ridge or embankment along resent and former paths of major river banks with shrap back slope, higher than surroundings , 4.0 - 6.0m amsl
Ridge or embankment along resent and former paths of major river banks with shrap back slope, higher than surroundings, 2.5 - 3.5m amsl
Series of low arcuate and elongated ridges, 2.0 - 4.0m amsl
Elongated ridge parallel to the flow direction, 2.0 - 2.5m amsl
Active processes
Splash, rill and gully erosion
Splash, rill and high gully erosion
Splash and rill erosion
Fluvial erosion, some sedimentation
Fluvial sedimentation, some erosion
Eventual flood sedimentation, erosion in places
Annual-flood sedimentation
Sedimentation and accumulation of organic matters
Sedimentation and accumulation of organic matters
Sedimentation and accumulation of organic matters
Splash, rill and gully and river bank erosion
Splash, rill, gully and river bank erosion, eventual flood sedimentation
Fluvial sedimentation and erosion
Fluvial sedimentation and erosion
Lithology
Clayey silt/silty clay, consolidated, highly oxidized iron concretions widespread
Clayey silt/silty clay, consolidated, highly oxidized iron concretions widespread, at places thin top layers of fluvial silt
Clayey silt/silty clay, consolidated, highly oxidized iron concretions widespread, at places top layers of fluvial silt
Clayey silt, few thin organic layer(s)
Clayey silt, few thin organic layer(s)
Top layers are alternating silty clay and clayey silt with sand layers
Silt, clay, fine sand, peaty clay and occasionally layers of peat
Clay to silty clay, layers of organic clay and peat
Clay to silty clay, layers of sand, organic clay and peat
Clay to silty clay, layers of sand organic clay and peat
Fine to coarse grained sand, mainly on top of Madhupur Terrace
Layers of fine sand and clayey silt
Fine to medium grained loose sand
Fine to medium grained loose sand