I seriously doubt that the cause of the floods all around the metro was the rain. That really didn't feel like a month's worth. Double the amount of rain ng Katrina sa US?? Oh kamon...
The water level was rising too fast and the rain wasn't consistently pouring down hard to attribute the floods to just the rain.
I really think nagpalabas sila ng tubig sa isa sa mga dams which is why all this flooding happened.