Encapsulation for attenuation systems
The SEL Source Control System recognises the importance of ensuring the integrity of attenuation systems where it is essential that fluids are to be kept within the drainage system (e.g. where there is a potential of contaminants leaching into a protected acquifer). SELflex 1.0PP Geomembrane is a 1mm thick robust polypropylene sheet which requires joints to be fusion welded and subsequently air-tested. This in turn is protected by SELtex 300R, a 300g/mm2 Geotextile with exceptional dimensional stability consisting of a woven polyester core reinforced with needle-punched outer layers. This arrangement must be used where the engineer insists on a watertight system. If permeability rates are too low for full infiltration, but it is not essential to provide a watertight arrangement, then SELSudstex Permafilter Geotextile should be used.