An elongate barrier material comprising an elongate apertured load-bearing sheet material and an elongate apertured filter material attached to the load-bearing sheet material. The apertures in the filter material have an ASTM D-4751 size less than 500μ and the size of the apertures in the load-bearing material is at least 4 times the size of the apertures in the filter material. The length of the filter material can be changed elastically so that the barrier material can be transported in the form of a roll which can be unrolled for installation.