Geocomposite Drain behind Soil Nail Wall

[moe333]

Hi All,
I'm reviewing soil nail wall plans. They show 1 - 1' wide geocomposite drain between soil nails spaced about 5.5' horizontally. Wall is up to 25' high. I'm not anticipating a lot of seepage (Southern California), but 1' just seems a little skimpy. Is this fairly typical?
Any thoughts?
Thanks

 

[emmgjld]

That spacing & amount is about what is common in Colorado, assuming the seepage isn't large. A lot depends on the anticipated seepage patterns.

 

[PEinc]

Sounds like plenty to me also. I usually make my drains wider but install them in every other bay (at about 10' c.c.).
If a lot of water is expected, it probably should not be a soil nail wall.

http://www.PeirceEngineering.com