I think the first project that the wickdrains have been used was in Belgium, in the Brussels Metropolitan Transport system. The second may be the Eskisehir light rail tram system.
Actually the main application of PVD's are in soil consolidation. But in this tram project it was used to collect the leakage water to prevent not to pass the lower section to cause rusting. So, if it is a good drainage material and if it works also horizontally why not we use horizontally.
Colbondrain (a Dutch made PVD from Colbond geosynthetics bv.) was laid horizontally, and to collect more water they made some loops upwards.
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