Two studies on the impact of Meghna-Dhonagoda flood control, drainage and irrigation project : I. an impact evaluation of the Meghna-Dhonagoda embankment and II. an impact on environmental changes and people's perception of the Meghna- Dhonagoda embankment, working paper number 19, BRAC-ICDDR,B joint research project. (BRAC-ICDDR,B joint research project, 1997)