Model Name
Primary Hazard
River flood (fluvial)
  • Africa
  • Oceania
  • Latin America and the Caribbean
  • Northern America
  • Asia
  • Europe
Simplified BSD License, with the intellectual property rights (IP) reserved by Deltares
Info URL
Mathematical model
Probabilistic and Deterministic
First Release
Last Release
Actively Used In Sector
  • Disaster Risk Management
Secondary Hazard
Surface Flooding (pluvial)
Financial module
(i.e. insurance
policy conditions)
Financial module (i.e. insurance policy conditions)
Not Included
The Delft-FIAT (Flood Impact Assessment Tool) is a flexible Open Source toolset for building and running flood impact models that are based on the unit-loss method. The modeler is able to build and run impacts models compatible with all major hydro-dynamic and GIS-software. To download Delft-FIAT contact Kymo Slager ( Delft-FIAT does not come with exposure or hazard data - these must be supplied by the user. Hazard maps (representing a scenario, or a return period map) must be imported by the user. The modeler is free to use its own comfortable tools and interfaces (e.g. ArcGIS, QGIS, Python, Matlab) to build the input data needed for flood impact assessment. These are exposure maps, impact functions and maximum damages, all related through a model configuration file. The exposure maps should be formatted following an open data standard or defacto standard (e.g. Tiff, asc) and need to fulfill some basic requirements. The other inputs are managed through an excel worksheet. User manual: Slager, K., A. Burzel, E.Bos, K. de Bruijn, D. Wagenaar, H. Winsemius, L. Bouwer, M. van der Doef (2016), User Manual Delft-FIAT version 1, website:
Model Components
Default vulnerability functions (for multiple exposure types)
Spatial Resolution
Spatial Resolution Hazard
  • Uniform Resolution Grid (<10 m cell size)
  • Uniform Resolution Grid (11 m to 100 m cell size)
  • Uniform Resolution Grid (101 m to 1000 m cell size)
  • Uniform Resolution Grid (>1000 m cell size)
Spatial Resolution
Spatial Resolution Exposure
Event Catalogue
Vulnerability Modifiers
Primary Modifiers
Loss Amplification
Accounted For
Uncertainty Accounted For
Exposure Types
Supported platform
Excel, ESRI ArcGIS 10.2.2, QGIS Free and Open Source Geographic Information System, Other
Platform details
There are different ways to run a Delft-FIAT model: - stand-alone using a DOS-command (incl. batch possibilities); installation is just unzipping the into a local system folder (see section 2.4) - stand-alone using a Python command; unzip the into a local system folder and install the appropriate Python version (see section 2.2) In both cases, a user needs a normal windows-pc, at least 500 MB of disk space. With Python, some additional libraries need to be installed. See:
Application Cloud
Application Cloud Hosting
Client Requirements
Client Requirements
Client Requirements RAM/CPU
Browser Version
Kymo Slager
Email Address /
Contact Details
Email Address / Contact Details
+31 (0)88 335 8273
Supporting Documentation
Services abstract
User guide and supplementary material at
Services downloads