Impact of Climate Variability on Flood Management in Dhaka City  

Oleh:

Kabir, M. R. ; Haque, Anisul

Jenis: Article from Proceeding
Dalam koleksi: 12th ANQ Congress in Singapore, 5-8 Agustus 2014, page 1-11.
Topik: Climate change; Dhaka City; Flood embankment; water logging; Flood hydrograph
Fulltext: EN1-1.5-P0222.pdf (626.61KB)

Isi artikel

Bangladesh will encounter impacts of global warming due to change in temperature and precipitation accompanied by sea level rise in the Bay of Bengal. The impact of climate variability will be felt across the country. But the nature of impact will be different in urban and rural areas. The former will face greater threat of inundation due to over-topping and possible breach of flood protection embankments, which may become further exacerbated due to internal drainage congestion. The latter will face prolonged inundation leading to substantial loss of life, property and crop. Projected climatic parameters were used to develop flood hydrographs at three locations in the Ganges-Brahmaputra-Meghna system – Hardinge Bridge, Bahadurabad and Bhairab Bazaar. Rating curves at these locations were used to estimate corresponding water levels, which along with the projected sea levels, were used to derive the boundary conditions for the rivers surrounding Dhaka City. These boundary conditions, projected internal runoff from the city and existing flood protection embankments were incorporated in the scenario analysis and suggesting adaptation measures for the years 2030 and 2050. In terms of physical adaptation, the height of the present embankment has to be raised by about 1m. Existing pumping capacity will be able to provide protection for many years with occasional failure to meet the peak demand

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