Entire Bangkok neighbourhoods were inundated on Saturday as the city government declared a flood disaster after the worst rains in years overwhelmed the Thai capital, submerging roads, cars and forcing thousands to leave their homes. Bangkok is flood-prone, especially during the monsoon season, but waters rarely linger for long. Nonetheless, the city’s drainage is notoriously ill-equipped to handle storm bursts as it struggles to cope with waters that have reached at least two feet (60cm) and...