×
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

Weeping tile design

Weeping tile design

Weeping tile design

(OP)
Been asked to conceptually design a weeping tile around a large (1000x750' or 325x230m) warehouse. Any suggestions as to where I should start?

Thanks in advance!
Chris

RE: Weeping tile design

What is the condition of the groundwater? Draining a lake or a desert? Typically use 300' as a max run with laterals at 100' max... works fine in our environs but, we don't have much groundwater.

I'll post my notes for drainage, later.

Dik

RE: Weeping tile design

(OP)
Building is founded on several metres of compacted fill consisting primarily of silty sand. GWT approx 10m below the building.

RE: Weeping tile design

For groundwater that low, why do you need it? Is it only to handle building runoff? If so, I agree with dik; except that I would cut the length of runs even lower.

If this is for roof runoff from collectors or downspouts, I'm not a fan of "hiding" the runoff. If an underdrain becomes clogged (and with silty sand surrounding it, there's a good chance of that), the water will backup and cause damage to the downspouts, the roof, or the structure.

I would create a series of "dry wells" lined with filter fabric and filled with gravel at or near each outlet and let the water drop into there.

RE: Weeping tile design

(OP)
Ron, thanks for your comments. The weeper is just to ensure the long-term performance of the foundation - the thought being that if they're sitting in a wet trench something could happen. Roof drains, as you suggest, will be directed to infiltration areas far away from the building.

My ignorance comes to the fore: dik said "300' max run with laterals at 100' max": what is a lateral? I cannot connect the weepers to the on-site storm sewers, as I'm designing parking lot storage: there's no free outlet. "300' max run" means that I could go 600' between sump pumps??

Thanks again!
Chris

RE: Weeping tile design

Added info, I usually run perf pipe a max 300' before it changes direction of slope... this varies and for residential const, I usually use 40' to 50'. For a large warehouse without lots of ground water, 300' is OK.

Laterals are the drain tiles connecting the perf pipes to the sump (or, free drainage).

I usually determine the number of sump pumps from the water condition and/or the size. If problem water, then I often use 2 for redundancy, even for a small area.

The longer the run, the deeper the trench excavation and you should keep this above the lowest point of discharge <<++G++>>.

The attached are part of my General Notes (now over 300k in size). They are modified for each project and, depending on the use, have been upgraded for [Imperial | Metric]

Good luck...

Dik

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