Barangay officials explained that the area routinely floods during sudden, intense downpours because the local drainage system cannot handle the large volume of rainwater. Following the heavy rain and flash floods, traffic built up along EDSA-Santolan heading into Pasig via Meralco Avenue around 8 p.m. Heavy traffic was likewise observed along C. Raymundo Avenue. "The drainage system still can't handle that volume of rain because our water outfall in Acacia is too narrow, which slows down the water flow," he added. Along EDSA, the heavy rain coincided with rush hour.