Padma Multipurpose Bridge Project

12. Estimate of future sea level rise is assessed using the same dataset of an existing study titled“Impact Assessment of Climate Changes on the Coastal Zone of Bangladesh” (WARPO, 2005).All the three scenarios have been investigated and it is revealed that a net sea level rise of 1.00 m,0.60 m and 0.26m may cause rising in water level at the bridge site by 0.47m, 0.27m and 0.09mrespectively. This rise in water level has direct impact on the river itself and its surroundingenvironment. It is also found that for the most extreme condition, i.e. for 1m of sea level rise, landward propagation of sea may be around 40 km down from the proposed bridge location and thusthere will be no effect or no direct inundation in the surrounding locations at the proposed Padmabridge location due to sea level rise of 1.0 m.Table 5-1: Propagation of sea level into the river and estuary including Padma Bridge Location.Distance from theSea Level Rise (SLR in m)outer most boundary 0.88 1.00 0.60 0.26of SLR in estuaryRise in water level due to SLR (m, PWD)(km)26 0.85 0.96 0.55 0.19105 0.80 0.90 0.52 0.18131 0.65 0.73 0.42 0.15149 0.60 0.68 0.39 0.14168 0.50 0.56 0.33 0.11240 (Padma Bridge) 0.42 0.47 0.27 0.09SLR = 0cmSLR = 25 cmPadma Bridge at MawaPadma Bridge at MawaSLR = 50 cmSLR = 75 cmPadma Bridge at MawaPadma Bridge at Mawa5-4