Padma Multipurpose Bridge Project

ParametersValueMaximum Discharge (1998 Flood)115,711 m 3 /secDesign Flood (100-Year Return Period) 148,000 m/secDesign maximum velocity4.6 m/sCheck-flood maximum velocity5.1 m/sScour Elevations alongside bank, 100yr -47 m PWDScour Elevations alongside bank, 500yr -55 m PWDScour Elevations at guide bund ends, 100yr -55 m PWDScour Elevations at guide bund ends, 500yr -60 m PWDSource: Consultant RTW Scheme Design Report, 200934. The width of the Padma at the Project site varies from 2 to 6 km from 1976 to 2009. Thewidth of the river increased from 2 km in 1968 to 5 km in 1990. The river started to shrink to a width of4 km in 1995. From 1995 on the river has kept widening to its present width of 6km (Figure 3-15). Theaverage water level slope of the Padma is about 5 cm/km. Locations of tributaries of River Padma andits channels near the Project area are shown in Figure 3-16. In addition, there is several surface waterbodies (ponds) located in the Project area. Arial Khan River and Naodoba River are the tributaries ofPadma located near the Project area. Table 3-10 shows the list of rivers in the project area. Thecanals (Khal) located in the Project area are Shikderkandi Khal, the Kutubpur Khal, the BorokaopurKhal and Padma Charland Mollahkandi Khal. Details of the ponds in the Project area are given inTable 3-11.River/ KhalsFigure 3-15: Padma River width in last 160 yearsTable 3-10: Rivers/khals in the project areaLOC.Span(m)Flow Area(m 2 )WettedPerimeter(m)Discharge(m 3 / sec)Naodoba 18+100 190 516.7 235.31 246.90Shikderkandi 21+985 150 480.32 246.38 212.01Kutubpur 22+505 150 441.21 204.64 208.27Borokeshobpur 23+260 210 523.19 290.49 219.06Paddy field 23+730 270 801.4 352.95 391.58Mollahkandi 25+430 30 62.85 71.14 16.37Table 3-11: Distribution of Ponds in the Project Influence AreaDistrict upazila Union Mouza No. of PondsMadaripur ShibcharChar Chandra 8Karali 0Bhasldi 0Kathalbari Kathalbari 213-18