Padma Multipurpose Bridge Project

2. During FS, the location of the bridge was selected at Mawa – Janjira site based on an alternateanalysis of four possible sites. Also, a concrete extradosed girder bridge was selected as apreferred option based on the analysis of three concrete bridge options. In detailed design stagethe FS recommended bridge option was compared with a steel truss bridge. The following criteriaare used for comparative analysis of various alternatives for bridge. Similar criteria are also usedfor transition structures and RTW.1. Robustnessa. Structural efficiencyb. Superstructurec. Substructured. Accommodation of servicese. Length of approach viaducts2. Constructabilitya. Construction programb. Ease of construction3. Maintenancea. Inspection and maintenance access provisionsb. Operational issues including emergency maintenance accessc. Durabilityd. Safety4. Costa. Construction Costb. O/M Costs5. Social and Resettlement Aspecta. Land acquisition and resettlementb. Employment potentialc. Navigation6. Environmenta. River ecologyb. Fisheries and other aquatic lifec. Material quantityd. Dredginge. Aestheticsf. Upstream/downstream impacts7. Proven Previous Usea. Proven successful previous use6.2 Weighted Scores of Alternatives3. While comparing the various proposed options based on the above criteria, an analysis wascarried out by using scoring/normalization technique and employing simple methods such asweighted sum scores.4. Weightage factors are assigned to each of the criterion based on a discussion with the Projectteam members and BBA staff. The weightage factors were normalized to add up to 100.Weightage factors of each criterion were different for different structures as their relativeimportance varies from structures to structure.5. A score was given in the scale of 1 to 5 to each of the parameter for various options. Themaximum score 5 represents ‘most favorable’ and the minimum score 1 represents ‘least6-2