"Illustrate a scenario showing the natural flow of a river from upstream to down

"Illustrate a scenario showing the natural flow of a river from upstream to downstream. Depict a dam being constructed on the Bangladesh side of the river. The illustration should show two possible outcomes: first, the river creating an alternative route near the dam and flowing through it; second, water accumulating upstream of the dam, eventually leading to the dam breaking or overtopping. Emphasize the resulting severe flash floods and intense riverbank erosion in Bangladesh.