Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Rainfall instensity table for PA

Rainfall instensity table for PA

Rainfall instensity table for PA

Hey Guys,

Hopefully an easy question for someone out there that does work in Pennsylvania. I'm looking for a table of rainfall intensities for use with the Rational Method. I have a copy of Publication 584 which provides the actual IDF curves but not the data used to make the curve. The reason I ask is that I submitted some drainage calculations to PennDOT for review and apparently I interpolated incorrectly off the chart and was off 0.1 in/hr. In order to avoid this comment in future, I was hoping someone had a resource that provided a table of the rainfall intensities that was used to develop the IDF curves in publication 584. I guess an alternative would be to make sure I use a higher rainfall intensity than I interpolated just to be on the safe side.

Any help would be appreciated.

Thanks in advance


RE: Rainfall instensity table for PA

Well, it's complicated.

Most regulators want you to use tables they supply, usually in a drainage manual. Some have started switching over to using NOAA data, which can be grabbed at a much finer grain than state wide here:


Don't forget to convert rainfalls to intensities by dividing by duration.

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close