Flood Analysis Using HEC-RAS and HEC-HMS: A Case Study of Khazir River (Middle East—Northern Iraq)

Floods frequently threaten villages near the Khazir River’s floodplains, causing crop losses and threatening residential areas. We used flood-related hydrological software, including WMS HEC-HMS, to study this issue determine how reduce recurrence of flooding. The software can be calculate a hydrograph torrential flows in river drainage basin estimate volume water its flow rates on Earth’s surface. depth rain has been evaluated calculated SCS Unit Hydrograph for different return periods 2, 5, 10, 20, 50, 100 years. According our study’s findings, river’s floods ranged between 29,680 2,229,200 m3, maximum value 10.4 66.4 m3/sec during various reference periods. To analyze model flood risks River, HEC-RAS was combined with HEC-GeoRAS extension ArcGIS. were focus two periods, 2013 2018, based digital elevation discharge floods. classification map depths, areas risk varied from low very (80.31%), medium (16.03%), high (3.8%). analysis results revealed that closest mouth more affected by than other further downstream. HEC-HMS have shown strong correlation evaluating reliably forecasting future area.