Atlas 14 IDF regionalization - data updated 9/4/2013
To assist in using Atlas 14 data with the Rational Method, MnDOT has created 32 Atlas 14 Rainfall Intensity-Duration-Frequency (IDF) Regions. These regions supersede the 3 regions specified in the drainage manual. These tables were designed to be used with the Rational Method which is typically used for storm drain design and catch basin spacing. (click on region to locate IDF link). Note: Region downloads work best with Internet Explorer.
- Map of MnDOT's Atlas 14 Regions for download (JPG)
- Index of Minnesota Counties with assigned Atlas 14 Regions (PDF)
- Atlas 14 Regionalization Documentation (PDF)