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.[3] The steepness of the stream results in heavy flooding during the winter,[2] and in the past, parts of Highway 90 have been swept away.[4][5] 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.[5]