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

Stormwater Basin Liner

Stormwater Basin Liner

Stormwater Basin Liner

Working on a commercial site in northwestern PA that is located in a well head protection area.  The local municipality would like the stormwater basin to be lined to prevent water from seeping into the groundwater.

Any suggestions on what type of lining system would be most appropriate for this situation (HDPE, PVC, Geosynthetic or any others).  Also, any budgetary costs for these systems.

RE: Stormwater Basin Liner

Based on feedback from numerous contractors as well as the inspector for Delaware Natural Resources and Environmental Control, I would suggest looking into Bentonite Mat. One source:  http://www.cetco.com/groups/Lining/products/GCL.asp

RE: Stormwater Basin Liner

If you have a small basin, I think the poly liners would be quite expensive.  The travel to the site for the installation would cost more than the liner.

As Terry stated, something utilizing benetonite might be more affordable.  Whether it be a mat type system or you just incorporate bagged material into the top 9"=12" of soil within the basin.  If you use benetonite or other soil type liners, you will need to keep it moist by covering it with an adequate depth of other soils or maintain water in the basin.  If it dries and cracks the liner is useless.

What kind of soils do you have in the area?  If they are fat clays, they can be hauled in or used in place for the liner.  May check the permeability of the existing soils to determine if a liner is even needed.

RE: Stormwater Basin Liner

I agree with semo.  I work in southcentral PA (Harrisburg area mostly).  Sinkholes are a huge concern here.  Still, native soil liners are almost always acceptable.  Budget?  A little (ok, a lot of) hauling and compaction.  Almost certain to beat a manufactured item, which will still involve a lot of preparatory earthwork.

Three stipulations: if you have USC soils CH, CL OR MH, ML available, and the client is willing to lab certify your specified compaction and w, and if the reviewer is willing to accept your specifications (three big ifs, I know).

RE: Stormwater Basin Liner

Just to point out one thing on flexible liners (such as PVC) they can be prefabricated into the required size, there is a limit, but if so any local contractor can install it just by unrolling and pulling.  The cost of PVC or LLDPE is quite low and will be much cheaper to transport than bentonite, which many times costs more to transport than to buy.

RE: Stormwater Basin Liner

Thanks for the input.  I talked to a few suppliers and got different advice from each.  The two most suggested solutions were the installation of a PVC liner and the installation of a Polypropylene liner.  The budget numbers for the PVC liner were about $0.50/sf and the polypropylene was about $1.50/sf.  Will probably spec out a 40 mil PVC liner.

The use of native soils or the addition benotimite are good ideas, but I think the local well head protection committee would feel more comfortable if they saw a physical barrier as opposed to just soil.  

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


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