- Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

  • Business & Agriculture
  • Residents
  • Government
  • Education
  • Taxes & Finance
  • Visiting & Playing
  • Family & Health

Indiana Department of Natural Resources

Amber Alert
Amber Alert - TEST

Indiana Department of Natural Resources

Water > Publications > Rainfall Frequency for Indiana Rainfall Frequency for Indiana

Design Storms

1 Hour or Less

2 Hour

3 Hour

6 Hour

12 Hour

24 Hour

2 Day

4 Day

7 Day

10 Day

Probably Maximum Precipitation

Storm Distributions

SCS (NRCS) Rainfall

Design Distributions

Bulletin 71 Rainfall Depths


The material on this site is an outgrowth of several previous manuals prepared by Division of Water staff. It includes information on precipitation amounts, adjustment, and distribution for heavy storms. The expanded isohyets are the result of linear interpolation and do not indicate increased accuracy from the source documents.

Questions concerning the information contained here should be directed to:

Engineering Services Center
Indiana Department of Natural Resources
Division of Water
402 W. Washington Street, Rm. W264
Indianapolis, IN 46204
Telephone: (317) 232-4160
Toll free: (877) 928-3755
Fax: (317) 233-4579