×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# Open Channel Flow and headloss in bends

 Forum Search FAQs Links MVPs

## Open Channel Flow and headloss in bends

(OP)
I'm designing a system for a treatment plant consisting of a number of open rectangular channels and partial full circular pipes. I am using software to determine the hydraulic grade line, but when it comes to changes in direction in the channels, I can't seem to find any information on how to calculate the losses in bends for open channels. There are many software programs for straight runs, but in the real world, there are lots of bends. Does anyone know of software or the methodology to calculate this?
Replies continue below

### RE: Open Channel Flow and headloss in bends

Well usually in treatment plants the flow velocities in the open channels are slow enough and the total length of the open channels are short enough the headloss accumulated in theses channels can be safely ignored, considering you will be conservative everywhere else. If you have a baffled basin like a chlorine contact basin where the flow makes 180 turns many times, you can use the minor loss equation H = KV^2/2g where K is in the 2 to 3.5 range according to Design Municipal Wastewater Treatment Plant by WEF. If you need to deal with step up, step down, contraction, hydraulic jump etc., you can use the energy equation assuming the energy will be conserved.

### RE: Open Channel Flow and headloss in bends

bend losses are discussed in the LA County Hydraulics Manual. See conduits not flowing full. Superelevation is also discussed.

https://dpw.lacounty.gov/wrd/publication/engineeri...

#### 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.

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

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!