The mostly low land city of Palembang is divided by the Musi River. Palembang has expanded rapidly especially since the year 2000. Average rainfall annually is 2.6 metres. During its wettest months, the city's lowlands are frequently inundated by torrential rains. The number of flooding events increased from 18 in 2007 to 46 in 2012, with an increase in inundation height and duration. With no sea level rise, Palembang mean annual losses are expected to run at US$418 million (IDR5,900,000 million). With a 20cm rise, this figure is expected to raise US$4,764 million (IDR 66,700,000 million).