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2009 Products Geodrains

HI-DRAIN - applications

Hi-DRAIN’s symmetrically cuspated form has a high resistance to crushing. The structure of the cusps resists the effects of lateral shear which may adversely affect alternative ‘pillar type’ drainage cores.

Hi-DRAIN’s flat, reverse side and top ensures a low contact pressure and hence avoids point loads being generated. This is of special importance when being placed over and between waterproof lining systems.
Hi-DRAIN has twelve typical applications, presented below.

In order to enhance Hi-DRAIN’S drainage ability, it is also available in a perforated form. Perforations are supplied at 40 mm centres in a grid pattern in the valleys.

Related Information

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Enhanced Barrier

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More about Hi-DRAIN

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Leakage detection membrane in double lined storage facilities


Relief of hydraulic pressure build-up against structures


Prevention of moisture ingress to dwellings


Drainage medium over waterproof membranes in roof waterproofing applications


Damp-proof lining to surface beds on basements


Cut-off drains


Hydraulic pressure relief over earth sheltered structures


Damp-proof course for brick work


Drainage systems for the canalisation of rain, storm water and underground water


Underfloor drainage and pressure relief in high water table conditions for geomembrane lined or concrete structures


Gas relief in copping systems


Drainage of copping systems

Leakage Detection in Multiple Lined Facilities

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

Hydraulic Pressure Relief against Retaining Walls and Bridge Abutments

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

Over Waterproof Membranes on Roof and Earth Sheltered 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

Hi-DRAIN below Interlocking Block Paving

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

Cut-Off Drains

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

Drainage Systems for the Canalisation of Underground Water, Rain & Storm water

To ensure optimal water-tightness and drainage capacity, the entire structure of a canal should be constructed on a layer of free drainage material. The Hi-DRAIN is placed directly on the subsurface layer with the cuspates and geotextile in contact with the parent soil. The air cavity between the Hi-DRAIN and the geotextile collects groundwater and directs it towards drainage pipes along the base of the structures. The geotextile filters the water-saturated soil and hydraulic pressure build up against the structure is relieved. Hi-DRAIN can also be used as a combined blanket drain/formwork in the inverted mode below cast in-situ floor slabs.

Canals and Channels

2009 END

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PO Box 633
Isando 1600
South Africa

Telephone: +27 (0)11 974 5271
Fax:      +27 (0)11 974 4111
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 Date of entry: February 2004 | Latest Upload: 06 December, 2013