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Vegetation Cover in Rawdat Norah was estimated to be 0.635 Km 2 or 16.2% of the total area of the Rawdat which is 3.924 km2 . The main dominant vegetation is Rhazya strica. Some morphometric properties and the characteristics of the watercourse system affecting the capacity of the Wadi Al-Atsh watershed to transform rainwater into surface runoff water had been determined. Accordingly, the drainage area of Wadi Al-Atsh has been calculated and found to be 13899.7 km2 , where the watershed length reaches 170.9 km, and the average width of Wadi Al-Atash watershed also reached 81.3 km. The form factor ratio was found to be less than 1.277 indicating that the shape of the watershed is not circular in shape, the shape of Wadi Al-Atsh watershed is located within the relatively rectangular watersheds where its elongation reaches 0.78. This study also proven that the watercourse network system is similar to the dendritic drainage system with a total of 1759 watercourses, which confirms the ability of the water watershed to turn the rainwater into surface running water which may end with devastating foods. This study indicated that management of rangeland must incorporate to conserve vegetation and biodiversity of ephemeral streams in hyper-arid and arid regions. | Vegetation cover in Rudat Norah and morphmetric analysis of wadi Al-Atsh watershed, Northwester Riyadh region
