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).
Index of Minnesota Counties with assigned Atlas 14 Regions