Padma Multipurpose Bridge Project

5.5.2 Impacts Management/Adaptive Plan26. Based on the observed and projected trend or statistics in climatic parameters that will facilitatethe environmental assessment and considerations in detailed design the following recommendationsare made to include n Padma Bridge Design:o For the maximum sea level rise of 1.00 m in Bay of Bengal, rise in the water level at thebridge site is considered 0.47m. Combining the effects of sea level rise and increasebasin rainfall, 0.63m rise in water level or maximum water level of 7.44m PWD.o It is recommended to consider the maximum temperature of 46.6 0 C and minimumtemperature of 9.3 0 C in the design.o The design considered either the 1-day or 2-day consecutive maximum rainfall of 372 mmand 514 mm for a 1 in 100 year return period event.o The predicted peak discharge of 151,100 cumec and lowest flow as 7,345 cumec areconsidered in the hydrological analysis.o Maximum wind speed is predicted as 126 km/ho The risk of salinity intrusion in the Padma Bridge is considered to be nil or insignificantand hence excluded from the design considerations.26. The main design team and the River Training Works team followed the recommendation in thisregard.5.6 Monitoring, Follow-up and Adaptive Management27. Since the design life of Padma Bridge is 100 years, it is important that a monitoring, follow-upand adaptive management mechanism is in place. BBA should monitor the climatic status of theproject site by permanent hydro-meteorological stations in both sides of the river to monitor theclimatic parameters. Resource requirement and budget for setting the hydro-meteorological stationsare prepared and proposed in Chapter 8 for considerations. An adaptive management process willalso be employed by BBA to implement any remedial actions identified as necessary during thefollow-up program, as well as incorporate any new lessons learned into normal procedures. Adaptivemanagement can serve as an important learning tool for climate change action, as uncertainty aboutvulnerabilities and risks can be reduced by experience only if that experience is identified and passedon (to others) to benefit other large projects in Bangladesh. Moreover, project and climate changerelated knowledge, technology, policy and legislation are evolving. For projects of longer design life, itis appropriate to consider these changes as part of the follow-up program.5-8