Elongated bendable drainage mat

摘要

Elongated, bendable drainage mat having a rectangular transverse cross section and comprising a polymeric core having a plurality of substantially rigid fingers extending from one side of a layer and an enveloping water permeable fabric having a permittivity from 0.2 seconds-1 to 2.0 seconds-1 and a dynamic permeability after 106 loadings of at least 10-4 centimeters per second. Apparatus and systems using such drainage mat.