Originally Posted by 1idejim
IMHO anything shy of 18" wide ditch w/washed crushed rock is pretty much a waste.
i have done my share of ground water conveyance systems, the few that were designed as curtains and installed with trenches paled in comparison to a fabric lined spread design.
i would consider fiber lined trenches and infiltrator chambers on larger sites.
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I can understand and agree with what you are saying to some degree, but in all reality, if the pipe can catch water and take it away, then it's doing something regardless of the construction.
That and I'm sure it goes in part with soil conditions and structure.
Farmers trench or pull in 10-"-12" field tile with great results, with no sock or special drainage techniques.