The scientists conducted experiments to simulate how rainwater flows over paved surfaces during heavy storms. They used a new method to model runoff from small urban areas, like streets and parking lots. By analyzing the data, they found that the flow rate of the water increased as the rain got heavier. They also discovered that the timing of the runoff changed with the intensity of the rainfall. Overall, their findings can help improve how we predict and manage water runoff in cities during extreme rain events.