I plan to build a garden path covered with pine barks. To prevent weeds there should be some kind of ground cover under the barks, and this cover must be water permeable. I bought a woven geotextile fabric (polypropylene), described by the vendor as providing good permeability. After seeing the fabric I had doubts about its permeability: I tested it by pouring water on the fabric and check if the water ends in a plate I've placed underneath. At first the fabric seems perfectly waterproof, and there's no change for hours:
The water went completely through about 20 hours afterwards.
The question is: how can the vendor consider that the fabric is water permeable if the water doesn't go through for so long ? Under heavy rain we should expect the water to go through directly instead of stagnate for hours, shouldn't we ?
