Wadi Al-Mashqar in Al-Majmaah: Al-Morphometric Study using Digital

morphometric analysis plays a major role in assessment of rivers and dry basins. This study aims to determine the morphometric variables of the Wadi Al-Mashqar basin, which is one of the most important wadies in the Arriyadh region. The wadi outlet crosses through Al-Majma’ah city and confluences with the Al Kalbi wadi, which adds to the importance of the study, as over the last decades, Al-Majma’ah city has witnessed various flooding events. DEM was used as the main source data to extract morphometric characteristics. GIS was used as a tool to analyze the factors. Wadi Al-Mashqar ranks a five, according to Strahler stream order, with a total of 425 streams and total length of 627 km. The results indicate that the limited impact of torrential rain on the urban area in Al-Majma’ah city is due to the low drainage density, which averages 1.2 km/km2, as this leads to a slow impact of torrents.