An important thing is not to forget the drainage core of the drainage sheets or layers with a nonwoven (may be woven but non woven is cheaper) filter fabric.
The ready made drainage products already have filter on them. But you have to wrap filter on the drainage core. Otherwise the soil, gravel or etc may go inside the drainage layer and block the drainage or at least decrease the amount of water to be drained.Drainage sheets are used to remove excess water.
On the drainage layers you may use a water retention layer depending on where you live.
For more information on green roof solutions check our roof garden section for all posts of this subject. 
6 Comment:
Informative post.
Nice pictures with good explanation.
Cool and Keep it up.
:-)
Insurance Agent
Smiling Hello from Istanbul:)
I see your blog is devoted to Geosynthetics world. Reminded me that my sister was also in the same working area like you as she's got a bachelor in Construction eng.
Later on, we both transfered to the digital world, and still we are in it. I'm pretty familiar all these info provided here. Should let my sis know your page, I think she'd like to go back a bit though:)
This looks like an interesting blog, i will have to stay and snoop around for a bit!
This trick should also be considered for normal landscaping. Too often I find people with water in their basements from improper landscaping.
This isn't the only cause but by making sure that there's 6-12" of a foundation exposed to open air, and the filter fabric brought up (should you secure that?) you can maintain the slope of the exterior bed and provide better drainage:-)
I added you to my blogroll:-)
What a unique treasure! I love it dirt and all!!
Great idea! Seems like a good thing for urban areas as well.
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