Product(s):	PondPack, StormCAD, CulvertMaster, FlowMaster
Version(s):	All

 

Problem

Are Bentley's OpenFlows stormwater products (listed above) FEMA approved? If yes, which versions are FEMA approved?

Solution

As of September 2026, StormCAD and PondPack (8.0 and higher) are FEMA approved. CivilStorm models using the EPA SWMM solver are also accepted by FEMA. Refer to FEMA's website. 

The use of FlowMaster is approved by FEMA for normal depth calculations to establish base flood elevations for Letter of Map Amendment and Letter of Map Revision based on fill requests along streams, creeks, and rivers designated as approximate Zone A on NFIP maps. (Note: FlowMaster is not on FEMA’s Nationally Accepted Hydraulic Models list.)

Note:

• As of September 2026, the approved list seems to be available here.
• As of April 2021, FEMA no longer provides a specific list on their website, but an archive snapshot can be found here.
• As of July 2019, OpenFlows FLOOD is not FEMA approved.
• Bentley does not track which specific government agencies (such as US State Departments of Transportations, "DOT") have "accepted" or "approved" the use of specific OpenFlows software.

See Also

Validation or Certification documents for Hydraulics and Hydrology products