At least 16 people died in Indonesia’s capital of Jakarta and its suburbs after torrential rain brought on the worst flooding in years, drawing attention to the challenge of protecting one of the world’s fastest-sinking megacities from inundation. Intense storms that began on New Year’s Eve and stretched through Jan. 1 before abating have filled the city’s rivers and drainage canals, overwhelming flood embankments. Residents waded from their homes to more-secure places Thursday as the country’s national meteorological agency…