High Ground Water vs. Laying Sanitary Pipe
High Ground Water vs. Laying Sanitary Pipe
(OP)
Could anyone living in areas with high ground water give me some ideas about laying pipe in these conditions?
Almost 2 years ago we laid a sanitary main in an area with high ground water and heavily saturated soil. We lost almost all the road and brought in truckloads of boulders that were pushed into the soil about 8' deep and backfilled with import material. The main was televised for a two year warranty and was found to have sagged - drastically.
I don't know how to fix this. I am hesitant to have the contractor dig up and relay the main for fear it will be a rerun from the first time. I am also afraid that the sags will get worse as time passes.
If anyone could give ideas or share what is done in high groundwater areas I would really appreciate it.
Almost 2 years ago we laid a sanitary main in an area with high ground water and heavily saturated soil. We lost almost all the road and brought in truckloads of boulders that were pushed into the soil about 8' deep and backfilled with import material. The main was televised for a two year warranty and was found to have sagged - drastically.
I don't know how to fix this. I am hesitant to have the contractor dig up and relay the main for fear it will be a rerun from the first time. I am also afraid that the sags will get worse as time passes.
If anyone could give ideas or share what is done in high groundwater areas I would really appreciate it.





RE: High Ground Water vs. Laying Sanitary Pipe
If the site had been properly dewatered, likely you wouldn't have had the problems you described.
As for what to do now, dewater the site, lay a new line, and abandon the sagged line.
Your project geotechnical engineer should be able to help you with the details. If you don't have a geotechnical engineer, get one.
Best of luck.
Mike Lambert
RE: High Ground Water vs. Laying Sanitary Pipe
there are ways to improve the subgrade in a wet trench, for instance geogrid or geotextile can be layed in the trench to help stabilize. but really you need a good geotech to investigate and make recommendations for your project.
RE: High Ground Water vs. Laying Sanitary Pipe
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RE: High Ground Water vs. Laying Sanitary Pipe
I appreciate it. :)
RE: High Ground Water vs. Laying Sanitary Pipe
Buried Pipe Design
A. P. Moser, Ph.D.
RE: High Ground Water vs. Laying Sanitary Pipe
Make sure you get the backfill compaction checked (per a geotech, as already recommended) before installing the replacement pipe.
RE: High Ground Water vs. Laying Sanitary Pipe
If so laying pipes is a nightmare unless you fill down to something solid or create a raft or install pulls and bring it above ground.
No details so difficult to make judgement here bit it won't get better on its own. ..
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.