Lessons from Houston

The numbers are awesome. In a matter of hours, Hurricane Harvey dumped nine trillion gallons of rainfall on Houston and southeast Texas: at one stage, 24 inches of rain fell in 24 hours. Like all American cities, Houston is prepared for hurricanes and floods — but Harvey was of a different magnitude. ‘We have not seen an event like this,’ the chief of the Federal Emergency Management Agency, William ‘Brock’ Long declared. It led rapidly to unprecedented flooding in one of the world’s richest cities.

The photos from Houston have been heartbreaking. Pensioners have been pictured sitting half-submerged in retirement homes, awaiting rescue. Some 30,000 may be forced into shelters, and officials are braced for almost half a million requiring federal assistance. We have seen parents walking knee-deep in water with their children in their arms, and belongings balanced in bags on their heads. Families wait on the rooftops of their homes, stranded by the flood.