This page lists the computer models that have met National Flood Insurance Program (NFIP) regulations for flood hazard mapping, technical documentation for acceptable models and models no longer acceptable.
Current Nationally Accepted Models
- Nationally Accepted Models
- Locally Accepted Models
- Supporting Technical Documentation for Acceptable Models
- Numerical Models No Longer Accepted
- For More Information
All computer models referenced from this web page have met the requirements of Subparagraph 65.6(a)(6) of the NFIP regulations that explain conditions by which a computer model may be used for flood hazard mapping. For further information on these regulations and to learn how to get a model added to this list, please refer to the Policy for Accepting Numerical Models for Use in the NFIP. The Federal Emergency Management Agency (FEMA) has also developed the Conditional Permission to Disclose Source Codes and Users Manual and the Clarification of NFIP Criteria for Certification of Coastal, Hydrologic and Hydraulic Models. For further information on the FEMA policy of accepting GIS enhanced hydrology and hydraulics modeling tools, please refer to Memo: Policy for Accepting GIS Tools for Flood Hazard Mapping in the NFIP (August 2004).
The resources below include the current list of acceptable models, which have been separated into nationally and locally accepted categories; supporting technical documentation for certain acceptable models and a list of numerical models which FEMA no longer accepts for NFIP usage.
Nationally Accepted Models
This sub-category includes coastal storm surge, coastal wave height and coastal wave effect models.
This sub-category includes one-dimensional steady flow, one-dimensional unsteady flow, two-dimensional steady/unsteady flow and floodway analysis models. Policy for the use of HEC-RAS in the NFIP.
This sub-category includes single event and continuous event simulation models.
Locally Accepted Models
This sub-category includes coastal storm surge and coastal wave height models.
This sub-category includes one- and two-dimensional unsteady flow models.
This sub-category includes single event models.
Supporting Technical Documentation for Acceptable Models
Numerical Models No Longer Accepted
Numerical Models No Longer Accepted by FEMA for NFIP Usage
This category includes one-dimensional steady flow.
For More Information
For more information or additional assistance: