Rainfall Intensity-Duration-Frequency Coefficients

County-level rainfall intensity estimation for the United States using:   

The e,b,d values were derived from the depth-duration-frequency tabulations based on annual maximum series reported for each county centroid on the NOAA PFDS server, or derived from other sources for states without NOAA Atlas 14 updated values

Link to Thesis Link to report explaining use

13 JUNE 2025 Restored web tool onto new server. Users should be aware the underlying data tables pre-date the revised values on the NOAA Atlas 14 server and under-report estimates as compared to current values. Revision in-progress as programmer time permits.