The objective of this practice is to carry out flood hazard assessment, identify the potential flood prone areas and potentially affected infrastructure namely roads, settlements, agriculture and in-land areas etc. against flood hazard of particular return period i.e. 2, 5, 10, 25, 50 and 100 years.
This Recommended Practices uses the HEC-RAS 2D flood model. The model was developed by US Army Corp of Engineer’s Hydrological Engineering Center (HEC). The model can solve 1D and 2D flood hazard problems through 1D, 2D and 1D/2D coupling approaches.
HEC-RAS 2D requires following geometric datasets:
Digital Elevation Model (DEM)
Landcover/Landuse Map
Manning’s n layer
2D Flow Area
Boundary condition lines
River Cross-sections (in case of 1D and 1D/2D coupling approach)
Embankments
Restricted areas (if any)
The insights obtained through this Recommended Practice can be used by disaster management agencies and other stakeholders to plan flood rescue, relief and mitigation activities.
Related Practices
Related data
Disclaimer:
Neither UN-SPIDER nor the Regional Support Offices (RSOs) or their partners take any responsibility for the correctness of outputs from this recommended practice or decisions derived as a consequence.
