According to a recent estimate from the University of Wisconsin's Space Science and Engineering Center, Harvey is a once-in-a-1,000-year flood event that has flooded a massive portion of Southeast Texas the size of New Jersey.... The estimate was made by scientists at UW-Madison using data from NASA satellites and other sources. Harvey was a Category 4 hurricane with winds of 130 miles per hour when it made landfall near Corpus Christi on August 25th. It quickly weakened over land, but its water surge still caused widespread damage and killed 46 people in four states. The estimated flood flow rate was 30 billion gallons (119 million m3) over a period of about 70 hours. This is equivalent to approximately one foot (30 cm) of water flowing over the levees every second. In addition, the storm dumped another 10 to 15 inches (25 to 38 cm) of rain over southeast Texas, which added to the flooding caused by the high waters. This is not the first time that Houston has been hit by a major flood. In 2015, Hurricane Sally caused extensive damage in Louisiana before making its way up toward Texas. The combined effects of Sally and Harvey created a deadly torrent that swept away several towns in its path. In fact, since 1884, there have been no days without any reported deaths due to flooding in Houston.