×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Drainage study using CALTRANS information

Drainage study using CALTRANS information

Drainage study using CALTRANS information

(OP)
I'm trying to do a drainage study near Lakespur, CA. They rely upon DOT design rainfall intensities. From a map called "I" am to look up my area and take from that a number. In my case the number is 1.4. From this number I'm to determine the 10 year and 100 year event. The problem is that I'm not sure how to calculte the 10 year and 100 year event.

RE: Drainage study using CALTRANS information



Are you using rational method?  For rational method calculation you will need to calculate time of concentration and rainfall intensity in order to determine what the peak discharge is (in cfs).

You can get the rainfall intensities from the NOAA 14 atlas. See the following website:
http://dipper.nws.noaa.gov/hdsc/pfds/

RE: Drainage study using CALTRANS information

Do you mean Larkspur, CA? If so, you may want to check out Marin County drainage instructions for additional information.

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!


Resources