A few months ago, I posted about the Rainfall Intensity and some of the information you will need to generate an intensity-duration-frequency curve. I want to provide a little more rainfall data, including some links to precipitation data.
I referenced the FHWA HEC-12 Document that walks you through both Eastern and Western calculations using HYDRO35 and NOAA Atlas 2.
Since I am in Illinois, we tend to use the rainfall data established by the Illinois State Water Survey.
Huff, Floyd A., and James R. Angel, 1992 ISWS B-71 NTIS#: PB93-164606
Frequency Distributions and Hydroclimatic Characteristics of Heavy Rainstorms in Illinois
Huff, Floyd A., and James R. Angel, 1989 ISWS B-70 NTIS#: PB89-203988
Time Distributions of Heavy Rainstorms in Illinois
Huff, Floyd A., 1990 ISWS C-173 NTIS#: PB90-253253
This is where the Huff Distribution found in the Hydraflow Precipitation Distributions for use in the SCS methods.
Neighboring Indiana has a great site for their rainfall data – “Rainfall Frequency for Indiana”
I would love to add your rainfall data.
MCA: Fixed the Rainfall Link for Indiana