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Frequently Asked Questions

StormBrixx is an innovative, modular, underground geocellular stormwater management system designed for surface water retention, detention and infiltration.

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Detention system also known as ‘OSD’ (On-site Stormwater Detention) or ‘attenuation’ is the process of holding and releasing the water slowly back into the stormwater system or natural water courses reducing the risk of flooding downstream following an intense storm.

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Retention system (storage) or ‘rainwater harvesting’ is the collection and permanently storing of rainwater for reuse to water gardens, fields and lawns.

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Infiltration system like ‘soakwells’, stores the water temporarily and allows the water to slowly seep back into the ground as the water table drops. Water is filtered through the surrounding sandy soil to recharge the groundwater.

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Geomembranes are used to wrap detention and retention tanks.  They are impermeable and are taped together with butyl mastic tape to hold in the water.  For site sensitive locations, such as near building footings, geomembranes can be welded together for a watertight tank by an experienced plastic welder.

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For infiltration tanks, a permeable woven geotextile is recommended to allow the water inside the tank to slowly seep into the surrounding ground.  For detention and retention tanks, a non-woven geotextile is recommended on the outside of the geomembrane to protect the geomembrane from punctures during backfilling.

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ACO recommends 100mm of coarse sand over the top of the tank, then at least 400mm of backfill before a small roller or excavator can be used to lightly compact the material.  Depending on the cover required, add more fill or cut back the compacted fill to accommodate slab. Note, compaction plant over the top of the tank should not exceed 2,300kg per metre width. Do not park any vehicles over the tank until the final pavement has been installed.

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A vent is required to allow the air to escape when the tank fills up with water to eliminate the risk of internally pressurising the StormBrixx tank.

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The StormBrixx tank pillar design allows the whole tank to be inspected.  The tank can be inspected through access or inspection points connected from the top of the tank to the surface level, or through the inlet and outlet pipes.  Cameras can be lowered into the StormBrixx tank to inspect the tank for silt and sediment.  Pressure washers can be used to break up any silt or sediment.  A sucker truck with a vacuum pump is used to suck out all the water and the suspended silt/sediment.

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