Contents
Which satellite data is best suitable for flood inundation mapping?
The Sentinel (S1A and S2A) data are suitable products for flood inundation mapping. In addition, the SRTM (DEM) provides the elevation data.
What is inundation depth?
Inundation is the total water level that occurs on normally dry ground as a result of the storm tide, and is expressed in terms of height of water, in feet, above ground level. Inundation provides the most clearly and commonly understood method for communicating storm surge- driven coastal flooding.
How is flood mapping done?
Flood mapping is done by overlaying the inundated layer on the district boundary map. The flood assessment is performed by calculating the district-wise zonal statistics (the total area inundated in each district in sq. kms).
How to create flood hazard maps using HEC-RAS?
=> Select the tool (Add Features). Start digitizing the river centerline from upstream to downstream until the end of Baxter River. Click in the direction of flow. => Double click when done. => Start digitizing the river centerline from its upstream end towards the junction with the Baxter River.
What is the goal of this flood hazard mapping recommended practice?
The goal of this Flood Hazard Mapping Recommended Practice is to evaluate the possible inundation extent in a river reach using the basic functions of RAS Mapper in HEC-RAS to create a 1D model of a river system. Mapping the results of a hydrodynamic model to determine the inundated areas is important in order for:
What do you need to know about HEC-RAS?
In order to start the tutorial, you need to be familiar with the HEC-RAS modelling system. A model in HEC-RAS is called project. A project consists of multiple files with multiple file extensions.
Where is the geometry data stored in HEC-RAS?
This is stored in a dedicated geometry file (.g0*). To create all necessary geometric data for HEC-RAS geometry file, before version 5.0.4, it was necessary to perform pre-processing of available data using HEC-GeoRAS plugin in ArcGIS. These elements are now created in the RAS Mapper component of HEC-RAS.