Perforated

Traditional multiple lined facilities have used a combination of impermeable Geomembranes, Geosynthetics Clay Liners, Geotextiles, Geonets and Sand. The Geonet-Geotextile combination or sand acts as a flow medium to carry leakage to a drain point. Sand layers often create difficulty in successfully spreading over the Geomembranes and have limited in-plane flow capacity. Geonet-Geotextile combination provides a restricted flow path under pressure and have a tendency to clog, further reducing the already low permeability.

Hi-DRAIN, however, provides a high capacity, non-restricted drainage path, is compatible with all commonly used geomembranes as it is manufactured from HDPE; has the same life expectancy as Aquatan’s properly stabilized HDPE geomembranes, can be engineered to withstand the temperatures generated in leach facilities without losing its properties or ability to drain; its already high crush strength can be enhanced almost infinitely. If used in conjunction with a Geosynthetic Clay Liner, Hi-DRAIN can provide both drainage and an additional liquid barrier.

Unlike Geonets, Hi-DRAIN is not susceptible to clogging by Bentonite Powder used in conjunction with GCLs. Where required, a Geotextile can be laminated to the Hi-DRAIN in our manufacturing facility.

Secondary Liner

Leakage Detection in Multiple-Lined Facilities

Traditional drainage systems are composed of graded granular filters, no fine concrete or porous concrete blocks, which experience problems of silting-up, blocking and cracking. These systems are also expensive to transport, difficult and expensive to construct and achieve variable permeabilities. The use of HI-DRAIN eliminates all these problems.

Pressure Relief below tanks & reservoirs

Pressure Relief against structures

Hi-DRAIN roofing applications generally occur in non trafficable areas such as reservoirs and roof gardens which are covered with topsoil and grass. A drainage layer is installed below the soil to prevent a build up of hydrostatic pressures and prevent the breakdown of the underlying waterproofing layer. Traditional gravel layers impose a dead weight on to the roof slab and require heavy duty lifting apparatus to transport the gravel from ground level to the elevated roof position. Hi-DRAIN, on the other hand, is lightweight, easily placed on site and has a flat base which automatically eliminates point loads on the underlying waterproofing. It should be laminated to a geotextile filter to prevent the overlying soils from ingress into the drainage channels. Hi-DRAIN thus maintains an open drainage path and unimpeded flow at all times.

 Roof Gardens

Where the founding layer is relatively impermeable - such as concrete, asphalt etc., falls are adequate, sufficient full-bores exist and there is a requirement for superimposed dynamic loads from traffic, a Hi-DRAIN drainage layer ensures the long-term performance of the block paving system. The Hi-DRAIN drainage layer removes seepage water within the sand layer which may otherwise become totally saturated resulting in pumping and loss of sand through the joints of the paving blocks.

 Parking Decks and Roof Slabs

Environmental problems are often caused by contaminated liquids in the subsoil percolating through the soil and seeping into watercourses and valuable ground water reserves. This problem can be solved by intercepting the lateral flow of the contaminant by placing a vertical barrier in the path of the flow. This is achieved by forming a cut-off barrier and drainage layer falling to a trench which is founded on an impermeable stratum such as clay. In this application the Hi-DRAIN composite performs the function of cut-off barrier, drainage and filter medium - all in one easily installed system.

Cut-Off Trench