×
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

Infiltration Trench with higher Outflow than Inflows

Infiltration Trench with higher Outflow than Inflows

Infiltration Trench with higher Outflow than Inflows

(OP)
Hello all...

I have a small drainage area (1.60 acres) sheet flowing into an infiltration trench  that is 3' wide by 155' long.  I have added exfiltration as discarded and the primary outfall is the top of the trench entered as a custon wier. The water surface elevations for all storm events stay below the top storage elevation.

When I run the program it is error free.  BUT...my 10 year storm envent inflow is 0.65 CFS, outflow is 0.68 CFS, discarded 0.01 CFS, and primary 0.66 CFS.  Why is the total outflow greater than the inflow?

My water quality storm and 2 year storm the inflow is greater than the outflow.  The 100 year storm is equal.  

Any ideas?
 

RE: Infiltration Trench with higher Outflow than Inflows

This condition should generally be flagged by a warning message.  Please click the message for further details and recommendations.  If there is more than one warning, be sure to review all the messages to determine the best course of action.

If you have further questions, you may want to send the project file to HydroCAD support.
 

Peter Smart
HydroCAD Software
www.hydrocad.net
 

RE: Infiltration Trench with higher Outflow than Inflows

(OP)
I am error message free....

I guess my next step is to send the project file over...

RE: Infiltration Trench with higher Outflow than Inflows

There will always be something in the message window - not necessarily "errors", but hints and warnings about the calculations.
 

Peter Smart
HydroCAD Software
www.hydrocad.net
 

RE: Infiltration Trench with higher Outflow than Inflows

Have you tried to downsize the size of the trench and see what happens?

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

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