Amazingly, Dubai doesn't have a sewage infrastructure to support its skyscrapers, including the world's tallest building, the Burj Khalifa. Drivers said they'd been queuing for three days! Unsurprising then, that many dump their loads into storm drains that lead directly to the open sea. Tourists are warned of the risk of contracting serious illnesses like typhoid and hepatitis if swimming on Dubai beaches. Wikipedia on sanitation in Dubai.