Despite these improvements, the transit system continues to experience flooding problems. On August 8, 2007, after more than of rain fell within an hour, the subway system flooded, causing almost every subway service to either be disabled or seriously disrupted, effectively halting the morning rush. This was the third incident in 2007 in which rain disrupted service. The system was disrupted on this occasion because the pumps and drainage system can handle only a rainfall rate of per hour; the incident's severity was aggravated by the scant warning as to the severity of the storm.