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World Disasters Report 2010 - International Federation of Red Cross ...

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Table 2.2 Port cities with population over 1 million estimated to have highest increased<br />

population exposure to surge-induced floods, 2005 to projected 2070<br />

City Country<br />

42<br />

Population<br />

2005 (000s)<br />

Population<br />

exposed 2005<br />

(000s)<br />

Population<br />

exposed 2070<br />

(000s)<br />

Increase<br />

Quingdao China 2,817 88 1,851 2,103%<br />

Luanda Angola 2,766 1 18 1,800%<br />

Dhaka Bangaldesh 12,430 844 11,135 1,319%<br />

Mogadishu Somalia 1,320 9 115 1,278%<br />

Conakry Guinea 1,425 41 496 1,210%<br />

Chittagong Bangladesh 4,114 255 2,866 1,124%<br />

Ningbo China 1,810 299 3,305 1,105%<br />

Dar-es-Salaam Tanzania 2,676 36 351 975%<br />

Yangon Myanmar 4,107 510 4,965 974%<br />

Karachi Pakistan 11,608 49 473 965%<br />

Douala Cameroon 1,761 11 101 918%<br />

Lagos Nigeria 10,886 357 3,229 904%<br />

Kulna Bangladesh 1,495 441 3,641 826%<br />

N’ampo Republic <strong>of</strong> Korea 1,102 22 181 823%<br />

Port-au-Prince Haiti 2,129 1 8 800%<br />

Source: Nicholls et al. (2008)<br />

Vision three: City-level data for multi-hazards<br />

The DesInventar database <strong>of</strong>fers a finer scale <strong>of</strong> data, with greater information at the<br />

local level, portraying a more detailed reality <strong>of</strong> risk facing cities and urban dwellers<br />

including small-scale events and everyday hazards.<br />

Using the city-level database from Cali, Colombia and plotting the events geographically,<br />

it is possible to see how the location <strong>of</strong> flooding events changes over time (see Figure 2.6).<br />

The details from Cali (analysed by Colombia’s Seismic Observatory <strong>of</strong> the South-West or<br />

OSSO) show how the pattern <strong>of</strong> flooding events is related to informal urban expansion<br />

in low-lying areas along the rivers, and to subsequent improvements in infrastructure<br />

over time. In Cali, risk patterns for small flood events expand concentrically from the<br />

centre <strong>of</strong> the city outwards to the periphery following the expansion <strong>of</strong> informal settlements.<br />

Additionally, small pockets <strong>of</strong> risk may be found in central areas ignored by<br />

formal urbanization, such as riverbanks and steep slopes.<br />

Case studies <strong>of</strong> cities in Argentina, Costa Rica and Mexico also support the findings<br />

from Cali, showing how extensive risk is generated through urban expansion and closely<br />

linked to increased run-<strong>of</strong>f from new urban development, chronic underinvestment in<br />

city-wide storm and surface drainage, location <strong>of</strong> informal settlements in flood-prone<br />

areas and inadequate water management for wider watersheds. It is likely that urban

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