Why did many QC areas get flooded? Rainfall for 1 hour exceeded Ondoy's, LGU says

Many areas in Quezon City got flooded on Saturday, August 30, after heavy rains poured. The amount of rainfall that fell in one hour was more than that during Tropical Storm Ondoy in 2009, the QC government said.

Why did many QC areas get flooded? Rainfall for 1 hour exceeded Ondoy's, LGU says

Many areas in Quezon City got flooded on Saturday, August 30, after heavy rains poured. The amount of rainfall that fell in one hour was more than that during Tropical Storm Ondoy in 2009, the QC government said.