The topography of the Dolman city

Jun 30th, 2015
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1. Surface Geology of the Area: The topography of the Dolman city area is plain and it is built along the sea cost on the recently filled silt and sand sediments. In the Clifton area and in the vicinity of Dolman city, following three types of costal sediments occur

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DOLMEN CITY PROJECT REPORTProf. Dr. Viqar Husain (Convenor SEGMITE)Department of Geology, University of Karachi1. Surface Geology of the Area: The topography of the Dolman city area is plain and it is built along the sea cost on the recently filled silt and sand sediments. In the Clifton area and in the vicinity of Dolman city, following three types of costal sediments occur (Fig.1). i) Sand bar deposits: The sand bar deposits comprise of medium to coarse sand, micaceous and shifing sand dunes. ii) Coastal sand dune deposits: These are medium sized and shifting sand dunes. iii) Beach sand deposits: These are medium to coarse grained, unconsolidated sand with pebbles and broken shells. These have been marked but keep on shifting by wind into small coastal dunes. LEGENDFig. 1 Surface Geology Map of Clifton Area, Karachi Coastal Geology2. Subsurface GeologyThe subsurface geological bore hole data show that major sediments include filled material (water saturated) upto 6 meters depth. While, silty fine sand, medium hard siltstone and clay stone sediments occur upto 15 meters below the surface. Whereas, below this depth, there is solid strata comprising of hard sandstone and siltstone upto the depth of 46 meters (Table 1). Table 1. Subsurface Geology in the Clifton Area, Karachi 0/6 metersFill Material6-8 metersGrey, loose to mediumDense, silty, fine SAND, trace to little mica8-15 metersGrey, medium dens

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