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No-rise Certification for Floodways

The purpose of this page is to define No-Rise Certifications, a commonly used term in floodplain management.


Any project in a floodway must be reviewed to determine if the project will increase flood heights. An engineering analysis must be conducted before a permit can be issued. The community's permit file must have a record of the results of this analysis, which can be in the form of a No-rise Certification. This No-rise Certification must be supported by technical data and signed by a registered professional engineer. The supporting technical data should be based on the standard step-backwater computer model used to develop the 100-year floodway shown on the Flood Insurance Rate Map (FIRM) or Flood Boundary and Floodway Map (FBFM).

NFIP Requirement

Other Applicable NFIP Regulations


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Last Updated: 
02/19/2019 - 10:44