Numerical Models Meeting the Minimum Requirement of the NFIP
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 policy memorandum. FEMA also developed Conditional Permission to Disclose Source Codes and User Manual and Clarification of National Flood Insurance Program Criteria for Certification of Hydrologic and Hydraulic Models. The current list of acceptable models, which have been separated into nationally and locally accepted categories, can be accessed by clicking on the desired links below. Supporting technical documentation for certain acceptable models is also accessible from the bottom of this page. Also included below is a list of numerical models which FEMA no longer accepts for NFIP usage.
Nationally Accepted Models
- Coastal Models
This sub-category includes coastal storm surge, coastal wave height, and coastal wave effect models.
- Hydrologic Models
This sub-category includes single event, continuous event, and interior drainage analysis models.
- Statistical Models
- Hydraulic Models
This sub-category includes one-dimensional steady flow, one-dimensional unsteady flow, two-dimensional steady/unsteady flow, and floodway analysis models. New policy for the use of HEC-RAS in the NFIP.
Locally Accepted Models
- Hydrologic Models
This sub-category includes single event models.
- Hydraulic Models
This sub-category includes one- and two-dimensional unsteady flow models.
Numerical Models No Longer Accepted by FEMA for
NFIP Usage
This category includes one-dimensional steady flow.
Supporting Technical Documentation for Acceptable Models
- Floodway Analysis for SWMM Models
- National Weather Service's FLDWAV Computer Program
- Use of HEC-IFH Interior Flood Hydrology Package to
Perform Interior Drainage Analysis
Download Numerical Models Accepted by FEMA for
NFIP Usage
View Software main page
