Hazards in Dhaka City Essay

During the last couple of decades Dhaka urban center is one of the high-speed growing metropolises in the world. The urban development seems to lack in be after and the problem of urbanization be intensified by high state growth and rural urban migration. Again, Bangladesh suffers from natural calamities every now and so and the urbanization of metropolitan Dhaka is also affected by it. The animate utility services atomic number 18 not capable of coping with the increase demand of the urbanization process. Faulty planning, Lack of coordination among various agencies and overall cut off to environment issues affecting Dhaka include floods, which ar associated with river water run down and rain water stagnation, earthquakes and tornadoes.Flood HazardFlood is a role of hydro-meteorological phenomenon and it is very hazardous as it can cause crushing losses in proper(ip)ty and human lives. Fast and unplanned development aggravates the consequences of make full by increas ing the monetary costs of losses. These kinds of losses are particularly high in urban areas which would be possible to ease with proper planning and management of the urban structures. Geographical Information Systems (GIS) based simulation and Remote Sensing (RS) techniques can help by supplying maps and techniques as assistance to make early warning for risk areas. In this depicted object study, different criteria come been analyzed that have potential impact on the amount of devastation, such as the elevation of the areas, implosion therapy depth, create density, terrain slope, terra firma 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 deluge itself are also discussed. Finally, a flood prediction map for Dhaka City Corporation (DCC) in Bangladesh was prepared using the Multi-Criteria military rank (MCE) method wit h particular focus on the different criteria that influence the flooding in Dhaka city.Water LoggingWater enter is a very common problem in Dhaka city during the monsoon hitch as well as all the year round. Even a little rain causes seriousproblems in some parts of the city on every occasion and can create water logging situation for several days which in turn causes huge infrastructural indemnification by reducing the amount of accessible assets and supplies in the city. This situation ordinarily occurs due to unplanned infrastructure development, insufficient or limited waste pipe systems, blockage of the drainages, lack of consciousness of these problems by the inhabitants, unplanned build-up of areas within the city, plectron up the canals, lakes and water bodies in areas which are mainly acquired by trapping companies and brick burning industries within the city.The Dhaka city is commonly flooded as a result of rainfalls and the high water level of surrounding river sys tems. For instance, 1998 flooding was the most catastrophic in the flooding history of Bangladesh, where Dhaka city was affected by heavy rainfall and the high water levels of the river system. casual urbanization is increasing water logging.EarthquakesThe city can be hard affected by earthquakes as it has already happened in the past. Intensities of VI, VII, and VIII have already been registered in the city. The national building code of Bangladesh (BNBC 1993) includes three unstable zones, and Dhaka is located on the second one with a regularise coefficient equivalent to the 15% of the gravity (z=0.15g).According to the results of the Earthquake Disaster peril Index (EDRI) project, major earthquake risk is associated with the high vulnerability of the building stock due to both poor materials and poor construction processes.TornadosThe twain transitional periods between southwest and northeast monsoons over the Indian sub-continent are characterized by local severe storms. T he transitional periods are usually referred to as pre-monsoon (March-May), and post-monsoon (October- November). It is the pre-monsoon period when most of the abnormal rainfall or drought conditions frequently occur in different parts of Bangladesh. Also there are severe local seasonal storms, popularly known as nor?westers (kalbaishakhi). disgusting nor?westers are generallyassociated with tornadoes. Tornadoes are embedded within a experience thundercloud, and moves along the direction of the squall of the mother storm.The frequency of devastating nor?westers usually reaches the maximum in April, while a few occur in May, and the minimum in March. Nor?westers and tornadoes are more frequent in the afternoon. tabulate 3 shows some of the devastating nor?westers and tornadoes that hit Bangladesh. Nor?westers may occur in late February due to early withdrawal of winter from Bangladesh, Bihar, West Bengal, Assam, and next areas. The occasional occurrence of nor?westers in early J une is due to the delay in the onset of the southwest monsoon over the region (Karmakar, 1989). Table Some of the devastating westers and tornadoes