Kaohsiung and Pingtung flood, but it takes a lot of rain. That footage looks like a newish area of Kaohsiung, maybe New Zuoying somewhere. All the rain from the mountains is dumping into that area.

I had to abandon my car in a Kaohsiung flood once, near Chengching Lake, an area known for flooding. I was one of those idiots who tried to drive through the high water, and I made it! Until the car crapped out that is. At least I made it through the intersection. Wading waste deep in urban floodwater is a bit unsettling given all the literal shit you know you're wading through.