×
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

HydroCAD Dam outlets routing

HydroCAD Dam outlets routing

HydroCAD Dam outlets routing

(OP)
I'm modeling a dam which has multiple rectangular notches in a spillway/ b.c. weir. The flow drops down to an adjacent lower box culvert under the road (which can't handle the 100year flow) and then the water would rise up to and over the road (asymmetrical weir). What's the best HydroCAD way to model this...I've tried multiple ponds, pond & cb-pond, single pond. The low box culvert obviously doesn't flow until the spillway weirs flow at their higher level. Modeling as separate ponds does not result in a single/equal pond elevation, which is reality. Any ideas??

RE: HydroCAD Dam outlets routing

What - exactly - is wrong with the results? As a wild guess, you may not have the outlet routing setup properly. Hard to tell without seeing the HydroCAD project file. Are there any warning messages?

Two ponds would probably be the best approach: One for the dam storage and perhaps a zero-storage pond for the box culvert and road overflow. But a single-pond approach may also be possible, especially if the roadway is higher than the dam spillway.

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: HydroCAD Dam outlets routing

On reflection, you probably need a 2-pond solution in order to handle your outlet setup:

Pond 1 = Dam storage with multiple outlet weirs

Pond 2 = Zero storage with box culvert and road/weir outlet.

This will require a tailwater-sensitive routing procedure (DSI) in order to handle the tailwater effect on the dam created by the roadway. Set your dt to the 0.01 hours and look for any warnings.

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: HydroCAD Dam outlets routing

Quote:

Modeling as separate ponds does not result in a single/equal pond elevation, which is reality

why would you have equal ponding elevations upstream and downstream of the dam? even with tailwater effects from the road, the ponding levels should be different due to headloss

RE: HydroCAD Dam outlets routing

cvg - I wondered the same thing, but I'm guessing the road is higher than the dam, so the dam will be submerged at high flows?? Details needed here...

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: HydroCAD Dam outlets routing

(OP)
Thank you Peter. I used the dynamic S.I. and it seems to work. It's great to learn something new. Good reading in your manual too!
PFG

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