Padma Multipurpose Bridge Project

5.2 Data and Information Collection and Methods Followed5.2.1 GHG Consideration4. The GHG emission is calculated in accordance with the revised 1996 IntergovernmentalPanel on Climate Change (IPCC) for National GHG Inventories. This report contains a description ofinventory methodologies, and comprehensive emissions data. The inventory is divided into followingfive main categories and each of these categories is further subdivided within the inventory. Energy Industrial Processes Agriculture Land Use Change and Forestry Waste5. The IPCC methodology breaks the calculation of emissions (e.g., for carbon dioxide) from fuelcombustion into 6 steps:Step 1: Estimate Apparent Fuel Consumption in Original UnitsStep 2: Convert to a Common Energy UnitStep 3: Multiply by Emission Factors to Compute the Carbon ContentStep 4: Compute Carbon StoredStep 5: Correct for Carbon UnoxidizedStep 6: Convert Carbon Oxidized to CO 2 Emissions6. The inventory contains annual emission estimates of the following direct and indirect GHGsup to 2050 when the bridge will attain its full traffic capacity. Carbon Dioxide (CO 2 ) Methane (CH 4 ) Nitrous Oxide (N 2 O) Non Methane Volatile Organic Compounds (NMVOC).7. The data used for the estimation of emissions has been collected from the following sources. Bangladesh Statistical Year Book, 2007 Traffic counts data and traffic forecast by the design consultant Area of the asphalt pavement and the quantity of the bitumen Fuel consumption by type of vehicles Fuel consumption by ferries, launch, speed boat and country boat and the number of annualand or daily trips.8. As standard emission factors (EF) are not established for Bangladesh, the emission factorsfor the transport sector in the.inventory have been developed using the default values given in IPCCguidelines.5.2.2 Impacts Consideration9. The impacts consideration assessed the hydro-meteorological parameters that are directlyand indirectly exposed to climate change phenomenon for facilitating the detail design andenvironmental impact assessment process. In this regard, the study assessed the effects of climatechange on the river hydrology at the proposed bridge site. Projecting the impact of global climatechange on water resources therefore requires the ability to represent climate processes on a varietyof spatial scales, from global (40,000 km) down to local (5 km). In this regard, under the current scopeof works, neither any GCM or RCM climatic models nor any hydro-dynamic simulation was newlyconducted; rather raw data available from existing climate and hydro-metric observatories andregional projections from different sources were used. For detailed analysis please refer to Vol. 5Factoring Climate Change in the Design of the Padma Bridge.5-2