HEC-RAS
FreeVerified
The world's most used hydraulic model: free 1D/2D river analysis, sediment, water quality and flood mapping.
Iber
ActiveFree Spanish 2D hydraulic model — flow, turbulence, sediment and habitat modules behind a full GUI.
by GEAMA / Flumen / CIMNE
- Pricing
- Free
- License
- Freeware
- Commercial use
- Permitted
- Ecosystem
- GiD
- Platform
- Windows
About Iber
Iber, developed by GEAMA (University of A Coruña), the Flumen institute and CIMNE, is a freeware 2D finite-volume model for river hydraulics and floodplain inundation with modules for turbulence, sediment transport, water quality and habitat assessment — all inside a complete GUI built on GiD, so no separate mesh generator is needed.
It is the de facto standard for flood studies in Spain and widely used across Latin America; recent versions added GPU computing. For a zero-cost package with a real interface, Iber's breadth of modules is hard to match.
Where it fits in the workflow
TerrainCatchmentRainfallRunoffRoutingHydraulicsMappingReporting
Appears in collections
- Alternatives to HEC-RAS
Free and commercial hydraulic engines worth knowing when HEC-RAS is not the answer.
Alternatives to Iber
Ranked by the topics, categories and workflow stages they share with Iber.
BASEMENT
Free
ETH Zurich's free 2D hydraulics and morphodynamics simulator — rivers, sediment and hazard mapping.
Delft3D FM
Open Source
Deltares' open flexible-mesh suite for rivers, estuaries and coasts — hydrodynamics to morphology.
FastFlood
Free
Rapid flood modelling in the browser — steady-state inundation estimates in seconds, anywhere on earth.
Flood Modeller
Freemium
Jacobs' 1D/2D river and floodplain suite — a UK practice staple with a genuinely useful free tier.
LISFLOOD-FP
Open Source
The Bristol raster flood model behind global flood maps — open source with GPU-accelerated solvers.