Alternatives to Anti-seep collars
Alternatives to Anti-seep collars
(OP)
I have a general question in regard to anti-seep collars. We typically spec in our sediment basins; however, recently I have heard people say that they are not very effective and are prone to failure, especially as it is hard to compact the soil between the collars during berm/impoundment construction. Are anti-seep collars still standard practice for outlet structures or are there better ways of dealing with seepage along the pipe?
Thanks,
Drew
Thanks,
Drew





RE: Alternatives to Anti-seep collars
I'd use open-graded aggregate to surround the pipe for the lower third of its run. That way any water flowing along the pipe-to-backfill interface would have hydrostatic relief under burden and the risk of piping failure reduced.
This is a critical aspect to outlet pipe design! I've worked on several failures directy related to the topic of drainage along the pipe run!
f-d
¡papá gordo ain’t no madre flaca!
RE: Alternatives to Anti-seep collars
I'm very interested to hear more on this topic from engineers who don't recommend them, and what they do instead. I can't say I'm a huge fan of the method fatdad enumerated, though, because it would seem to me to encourage seepage instead of preventing it.
Definitely going into this thread with an open mind, though.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Alternatives to Anti-seep collars
I could convene a few dozen geotechnical engineers who know the perils of anti-seep collars and have had such warnings delivered in graduate school. Few civil engineers get similar warnings.
Just for further discussion, I'd use gravel to backfill the lower 1/3rd of concrete in a principal spillway also (or any sort of concrete wier).
f-d
¡papá gordo ain’t no madre flaca!
RE: Alternatives to Anti-seep collars
RE: Alternatives to Anti-seep collars
RE: Alternatives to Anti-seep collars
drewnje, if you are referencing an erosion and sediment control manual, I'm sure you are looking at the former, not a dam. Many state E&SC manuals do recommend anti-seep collars for temporary sediment basins, but you won’t see it in your state’s safe dam program’s design requirements.
RE: Alternatives to Anti-seep collars
RE: Alternatives to Anti-seep collars
http://www.mde.state.md.us/assets/document/damsafe...
Learn something new every day. Thanks guys.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Alternatives to Anti-seep collars
RE: Alternatives to Anti-seep collars