Rain to Flood Analysis
Rainfall-to-flood analysis for QGIS. Delineates the upstream catchment and longest flow path from a single pour point, downloads and analyses rainfall (ERA5, Open-Meteo, IMD, CHIRPS, NASA POWER, Excel), fits IDF/DDF curves, derives Curve Number and Manning's n rasters from land cover (ESA WorldCover, Esri 10m, NLCD, CORINE, MODIS), builds design hydrographs, and maps flood depth, velocity and hazard class using a HAND approach. Supports NRCS/TR-55, UK FEH, Australia ARR2019, Canada MTO, NZ NIWA and Middle East wadi methods, with HEC-HMS export.
Rain2Flood turns rainfall into flood maps inside QGIS. Give it a DEM and a pour point and it delineates the upstream catchment, traces the longest flow path, measures the main-stem slope, fetches rainfall, fits design storms, routes a hydrograph and maps depth, velocity and hazard class.
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Workflow: DEM and Slope, then Streams and Sub-basins, then CN / LULC, then either Flash Flood (sub-daily) or Standard Flood (daily). Rainfall Data is a standalone utility, not a pipeline step.
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No catchment polygon is required anywhere. Version 3.0 is a substantial correctness release; see the changelog.
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Cooked by Rahul Pandey - https://in.linkedin.com/in/rahul-pandey-nitb