Flash Flood Assessment and Management for Sustainable Development Using Geospatial Technology and WMS Models in Abha City, Aseer Region, Saudi Arabia

Abha city is distinguished by urbanization, infrastructure, deepening watercourses, and changes in runoff flow which encourage flash floods the urban zones of many villages region. AlMahalah village prone to flooding due its geographic location near outlet convergence streams significant flow. The Geographic Information System (GIS), Remote Sensing (RS), Water Modeling (WMS), Hydrologic Engineering Center-Hydrologic (HEC-HMS) were used assess effects on AlMahala village. Precipitation data from 1978 2020 was statistically processed analysed provide more information about flood hazards. With a 3-h lag time both watersheds, higher peak discharge Wadi than Al Akkas indicates that primary concern Abha. an average yearly rainfall 520 mm, hydrograph simulation 1 5 April would contribute junction (outlet) point with rate 474.14 m3/s. vegetation cover increased 243 km2 compared 2016. HEC-RAS model calculate water depth, velocity, elevation surface without dam installation. study provides administration practical reasonable procedures for avoiding destruction areas.