Volumetric Quantification of Flash Flood Using Microwave Data on a Watershed Scale in Arid Environments, Saudi Arabia

Actual flood mapping and quantification in an area provide valuable information for the stakeholder to prevent future losses. This study presents actual flash Al-Lith Watershed, Saudi Arabia. The is divided into two steps: first using remote sensing data, second volume calculation. Two Sentinel-1 images are processed map flood, i.e., image from 25 May 2018 (dry condition), 24 November (peak condition). SNAP software used step. During processing, selecting backscatter data representing arid region challenging. dB range value 7.23–14.22 believed represent flood. In GIS software, result converted polygon define boundary. boundary that overlaid with Digital Elevation Map (DEM) filled same elevation value. Focal Statistics neighborhood method three iterations generate surface inside raster contains depth derived by subtraction of DEM. Several steps carried out minimize overcalculation outside can be multiplication points each cell size area. Watershed on 155,507,439 m3. Validity checks performed comparing it other studies, shows number reliable.