×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Hint 61 and Error 62 in reach calculations

Hint 61 and Error 62 in reach calculations

Hint 61 and Error 62 in reach calculations

(OP)
Can someone please help me understand what

 Hint[61] :
{node} Submerged xx% of Reach x bottom

and

Error [62]
{node} Submerged xx% of Reach x inlet

mean?

I clicked on the error messages in Hydrocad, but I do not understand the explanations. What is the difference between the hint and the error>

RE: Hint 61 and Error 62 in reach calculations

Please note the exact wording:  Reach BOTTOM vs. INLET.

Hint 61 means that the tailwater elevation is covering part, but not all of the reach BOTTOM.  In other words, the tailwater is above the outlet invert but below the inlet invert.  Although the tailwater may effect the discharge, it isn't high enough to flow backwards and come out the reach "inlet"

Error 72 means that the tailwater is above the INLET invert. (so the bottom is fully submerged)  In addition to possible tailwater effects, this level could cause an actual reverse flow (water coming out of the "inlet"), depending on how it compares to the water surface at the inlet.

The messages indicate a progressively more significant tailwater conditon.  In either case, you need to verify that the assumption of normal Manning's flow in a reach is being met.  For details see www.hydrocad.net/reach.htm

RE: Hint 61 and Error 62 in reach calculations

Addition/correction to my last post:

HydroCAD also checks for reverse-head conditions at each time step.  WARNING 62 (not Error 72) indicates that the tailwater is above the inlet invert, but is still below the upstream water surface elevation at all times during the routing.  This indicates a greater likelyhood of reduced discharge due to tailwater, but NOT reverse-flow potential.

These messages correspond to four progressive reach conditions:

1) Tailwater below outlet invert, so no message.
2) Tailwater partially sumberges bottom, so Hint 61.
3) Tailwater above inlet invert, so Warning 62.
4) Tailwater above headwater, so Warning 63 (reverse head)

RE: Hint 61 and Error 62 in reach calculations

(OP)
Thanks for the explanation psmart

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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