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… recognise that the topography of the land determines the drainage basins and water divides. The catchment is defined … Other related terms include watershed, river basin and drainage basin. A catchment is also the basic unit of the … exposing downstream communities to flash-flooding. Drainage and infilling of wetlands also prevents natural …

… is fed by smaller rivers, and goes on to form smaller drainage basins, i.e. the sub- basins and micro-basins, spatially delimited by their respective drainage divisions. c. Depending on predominant climatic … do not always coincide with the areas delimited by the drainage divides. In this respect, an aquifer may transfer …

… project impacts. In Bangladesh, EIAs are required for drainage and irrigation projects that may impact wildlife …