Simulation of Extraordinary Flood Risks for the Diyala River Section Within the Abu Sayda and Al-salam Districts Using Hec-ras (Hydrological Study)

Abstract

The current study included (simulating exceptional flood risks for the Diyala River section within the Abu Saida and Al Salam districts using Hec-Ras), as the study area is located between two latitudes (33°51'57"N - 33°58'29"N) north, and longitude (44°39'1.803"E - 44°49'49.808"E) E A section of the Diyala River was studied between Abu Sidon district in the north and Al-Salam district in the south. The length of the studied river section was about (39) km. During the study, maps were made that simulate exceptional floods for the period (2013-2022), as it became clear that the year 2019 witnessed exceptional floods. The maximum discharge reached (733) m3/s, and maps were created simulating flood levels according to four levels of water height, indicating the extent of its impact on land cover within the studied area. The study found that flood risk increases near the river, as the affected lands amounted to approximately (14.5 km2, within a coverage range of 500 Meter, the lands affected by the 2019 flood amounted to (3.5) km2, within a coverage range of 1000 Meter. Water-damaged lands within a coverage range of 1500 meters decreased, as it amounted to about (1.1) km2, out of the total number of affected lands. As a result of the 2019 flood, which amounted to (19) km2.