The wadi (seasonal stream) drains the slopes of the Mount of Olives, Mount Scopus and Abu Dis in Jerusalem at 800 m above sea level and descends till the Dead Sea at 400 m below sea level. The steepness of the stream results in heavy flooding during the winter, and in the past, parts of Highway 90 have been swept away. The stream sweeps mud and debris along with the water and sometimes during flooding times it is possible to see a trail of mud, hundreds of meters long, in the waters of the Dead Sea.