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Bio-retention Systems

Contaminant filtration enables stormwater runoff to dissipate through permeable or porous substrate, filter through selected filtration media (eg. the natural subgrade or sand etc), then return to watercourses as 100% pure, clean water, recharging depleted ground water supplies in the process.

Large pavement areas in cities such as shopping malls, car parks and roadways create the largest stormwater outfall pollution problems. Now contaminant (bio)retention Systems utilising PermaPave™ technology can be economically installed in any area, without loss of land.
green conservation design
 Pits dug across the water flow, or at the low point of pavement areas, are filled with appropriate filtration media. Permapave structural grates or pavers are installed as pit covers and land returns to normal use.

Stormwater runoff passes through the grates or pavers into the pit. All gross pollutants are kept on the surface and some micro pollutants are trapped within the permeable mass of the grate or pavers.

Remaining contaminants are trapped within the filtering media. Only pure water drains from each pit, directly into the aquifers, recharging depleted ground water.

PermaPave entry grates and pavers can be cleaned as required. The contaminated filtration media can be removed and deposited at an appropriate site.
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how permeable pavers filter water
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water sensitive urban design