Padma Multipurpose Bridge Project

each, the top of the revetment can be set at the existing river bank level, so the structure will notinterfere with over bank flows, drainage or navigation.Figure 6-3: Alternative 1: Revetment on bank of south channel6.6.2 Alternative 2 - : Guide Bund and Upstream Hard Points on South Bank31. Based on the past experience at Jamuna Bridge and other bridge crossings in the Indian subcontinent,a guide bund could be used to protect the main bridge and viaduct structures (Figure 6-4).To protect the river attack on the new approach roads, two hard points are provided on the upstream.The hard points will reduce the risk of the river outflanking the RTW near main bridge and viaductstructures. The crest elevation of the hard points needs to be above the design high water level toprevent over tapping. These hard points will not prevent bank erosion between the two hard points andbetween the hard point and guide bund.6-20