Hazards in Dhaka City
13 Nov, 2013 Assignment, Terms, Thesis
During the last couple of decades Dhaka city is one of the fastest growing metropolises in the world. The urban development seems to lack in planning and the problem of urbanization are intensified by high population growth and rural urban migration. Again, Bangladesh suffers from natural calamities every now and then and the urbanization of metropolitan Dhaka is also affected by it. The existing utility services are not capable of coping with the increased demand of the urbanization process. Faulty planning, Lack of coordination among various agencies and overall disregard to environment issues affecting Dhaka include floods, which are associated with river water overflow and rain water stagnation, earthquakes and tornadoes. Flood Hazard:
Flood is a type of hydro-meteorological phenomenon and it is very hazardous as it can cause devastating losses in property and human lives. Fast and unplanned development aggravates the consequences of flooding by increasing the monetary costs of losses. These kinds of losses are especially high in urban areas which would be possible to ease with proper planning and management of the urban structures. Geographical Information Systems (GIS) based modeling and Remote Sensing (RS) techniques can help by supplying maps and techniques as assistance to make early warning for risk areas. In this case study, different criteria have been analyzed that have potential impact on the amount of devastation, such as the elevation of the areas, flooding depth, building density, terrain slope, soil type, land use types etc. Based on different factors analysis, results are visualized with the help of GIS and RS presentation and dissemination techniques. In addition, the impacts of different factors on flooding itself are also discussed. Finally, a flood prediction map for Dhaka City Corporation (DCC) in Bangladesh was prepared using the Multi-Criteria Evaluation (MCE) method...
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