For comparison and evaluation, the NFF program compares each extrapolated 500-year flood peak discharge with the maximum flood-envelope curves given by Crippen and Bue (1977) and Crippen (1982). The map below shows the different flood regions, and should be used to determine the appropriate region for your watershed. A default value has been determined for each region, but this value may be overwritten.
Related Topics:
Overview of NFF
Defining an NFF Simulation