Operation of Gate-Controlled Irrigation System Using HEC-RAS 2D for Spring Flood Hazard Reduction

Flooding events have been negatively affecting the Republic of Kazakhstan, with higher occurrence in flat parts country during spring snowmelt snow-fed rivers. The current project aims to assess flood hazard reduction capacity Alva irrigation system, which is located interfluve area Yesil and Nura Rivers. assessment performed by simulating floods using HEC-RAS 2D controlling gates existing system. A digital elevation model study domain was generated integration Sentinel-1 radar images data obtained from bathymetrical survey aerial photography. Comparison simulated inundation a remote sensing image April 2019 indicated that main reason for differences due local domain. Exclusion areas flooded snowmelt, were identified updated DEM, comparison increased similarity 70%. Further simulations different exceedance probability hydrographs enabled classification according maximum depth duration. Theoretical changes on dam crest as well additional proposed improve system flooding agriculturally important areas, not simulation developed could be used authorities further development mitigation measures plans