Padma Multipurpose Bridge Project

Sl.NoProject ComponentArea(m 2 )Ave.FillingHeight(m)Side Slope1 Approach Road 1,452,900 5 1:2 (Service road)1:4 (Main Road)Quantity ofMaterial forFilling (m 3 )4,794,5702 Toll Plaza 167,900 5 1:2 554,0703 Railway265,000 6 1:2 1,049,400Embankment4 Service Area 1,485,000 5 1:2 4,900,5005 Construction Yard 780,000 5 1:2 2,574,0006 Backfilling behind theRevetment Works60,000 0.5 1:2 19,800Subtotal: 13,892,340Total: 20,202,72037. Since it is a common practice in Bangladesh to use dredge materials for filling of the lands forroad, real estate and other construction purpose, there is a huge potential demand for the materials tobe generated from the Project.8.5.3 Disposal of Dredge Materials on Unused Charland38. Low lying, non-habitant and recently formed Charland are ideal sites for disposal of dredgedmaterials in dry season. Dredge materials can be placed on low lying Charland located on thedownstream side of the Bridge in reclamation areas to contain the sediments during the dry seasonand allowing them to erode during subsequent monsoon seasons. Measures against spreading ofturbidity from out flowing reclamation water into the river are considered unnecessary during or nearthe monsoon season, when the suspended solids concentration due to dredging outflow is negligiblecompared to natural background concentrations as explained previously. Alternatively, thesematerials can also be used by the other contractors for filling up of the Project sites. Further, owing tothe huge demand of the dredge materials, both public and private agencies can be provided access tocollect the materials for their own use at free of cost or nominal charges.8-37