Girl in a rickshaw travelling through flood waters. Dhaka is a city of over 600,000 rickshaws. The drivers - rickshaw wallahs - are mostly migrants from the countryside. Their vehicles are lovingly decorated with images of sports cars, dream homes, idealised rural scenes and movie stars. In 2004 monsoon rains caused flooding in 40 of Bangladesh's 64 districts, displacing up to 30 million people and killing several hundred.