الخصائص الهيدرولوجية لحوض وادي نعمان بمنطقة بمكة المكرمة

Abstract EN

The Wadi Numan Basin is characterized by hydrological features that create a temporary water source to the east of Makkah.

This water source occurs during the rainy seasons, duringwhich the basin is exposed to increasedamounts of runoff that flood different regions in the basin.

As these floods pose an economic and environmental risk to populations living in the basin, a detailed analysis of these hydrological characteristics that contribute to the basin runoff can provide a better understandinof the basin’s hydrology and its hydrological properties.

Combining this data with results from a hydrological database allowedus to produce a thematic map that considers the hydrology guideline and classifies different are as based on the hydrological degreeof risk.

Primary results showed that the Wadi Numan Basin records the dense time at about 5 hours and 14 minutes, while the surface runoff velocity reached 0.054 m3 / s, and the peak drainage reached 296 m3 / s.

The flow force was large and was recorded at 11.55, and the volume of runoff according to the Snydermodel was 195752 m3.

The response time for the basin reached nine hours and three minutes.

The risk is based on dividing the hydrological characteristics into groups according to values ranging between 1 and 36 degrees.

The Rahjan Valley and Mujireish, located in the south of the Wadi Nu'man basin, the The Alaq Valley in the east of the basin, and the Al Shazqa Valley northwest of the basin are the most dangerous hydrological basins, while the rest of the basins recorded a moderate degree of hydrological risk