×
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

looking for scour velocity threshold for concrete

looking for scour velocity threshold for concrete

looking for scour velocity threshold for concrete

(OP)
YAR! designing a debris deflector structure for a very steep stream. bed grades along the base of the deflector in the order of 15%. It is a constant flow stream and I am concerned about scour of a concrete slab proposed for the creek bed. I'm fishing for advice on permissible velocities vs concrete properties for continous flow conditions. There are a lot of papers around but they all seem to deal with short term scour potential under peak velocities during flood events. I'm worried about the day to day trickle flow over 50 yrs or so.  

RE: looking for scour velocity threshold for concrete

Are you more concerned with the abrasion from sediment within the flow or the chemical composition of the water?  Either way try contacting a conc pipe supplier.  They may be able to provide information on the long term impact in your scenario.

RE: looking for scour velocity threshold for concrete

you should be worried, it could scour much faster than 50 years. Your velocities will be nearly 20 feet per second, well in excess of the threshold for erosion. But the amount of scour is very dependant on the amount and qualities of the sediment. See attached paper on concrete erosion.

You may want to consider one or more of the following methods to reduce the erosion:

- reduce the amount of sediment by trapping it

- reduce the velocity to perhaps 5 feet per second or less

- increase the durability of the concrete

- increase the thickness of the concrete, especially the cover over the steel

RE: looking for scour velocity threshold for concrete

gbam has a good recommendation. You could also try the American Concrete Pipe Association or American Concrete Association for additional details, research and direction.

 

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