I don't appreciate the downvote because you aren't listening to what I'm saying.

When it rains, it floods. They (stupidly) build dams for rate of flow during low season (cause it isn't raining)... then the wet season comes and the dams all overflow. Poor construction practices doesn't help either. They also build dam after dam along the same river... I've see 10+ of these things... ends up being a chain of mess when the first one fails.

Just a bit of googling to give you examples:

"Dam design and greed may factor into flood devastation in Vietnam" https://www.refworld.org/docid/58f9ca0c13.html

https://tuoitrenews.vn/news/society/20231012/investigation-u...

https://www.voanews.com/a/vietnam-must-improve-flood-resilie...