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StormBrixx® - Retention
The StormBrixx® system can be assembled in a variety of ways and gives a high void ratio of 95%.
12,000 cubic feet were installed under a parking lot to tie into the existing stormwater system.
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What material is StormBrixx® made of?
StormBrixx® parts are made from polypropylene using both recycled and virgin material. This material was chosen for its resistance to corrosion and chemical leaching, its resilience against most forms of physical damage, including impact and freezing, and environmental benefits.
What are the limitations in terms of shape and size?
StormBrixx tanks are built using 0.6m(2ft)x1.2m(4ft)x0.61m(2ft) deep modules. A tank with any dimensions that are multiples of the basic module can be built. Any shape that has straight edges can be built subject to the previous condition.
How much weight can StormBrixx® take?
The short term ultimate compression strength at yield is 420KN/m2 (61psi). The compression strength of StormBrixx® was determined through rigorous and multiple testing inside and by independent research centers to ensure a reliable product.
Why is creep considered in the StormBrixx® design?
Creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. This is very much the condition in which an underground tank with permanent soil cover operates. Design for creep is essential for a long lifespan of any product of this nature. Creep behavior of the StormBrixx® module has been tested under continuous load for 10,000 hours and extrapolated to 50 years using accepted engineering methodologies to ensure long term life span.
Is surface deflection under live loads considered in the design of StormBrixx®?
Yes! Surface deflection is actually a very important parameter in the design of StormBrixx® and is, in most cases, the limiting factor in terms of allowable live loads. ACO recommends maximum 1mm surface deflection for frequent live loads and maximum 2mm for infrequent live loads. While surface deflections do not necessarily lead to tank structural failure, it leads to surface damage and continuous maintenance work for the owner of the facility, especially in cold climates.
Why is StormBrixx® superior to its direct competitors?
StormBrixx® was created to address weaknesses of existing product in the market. The material was shaped in a smart way to provide maximum stiffness and strength, allowing easy inspection and maintenance in any point of the tank. The basic module is made of only two parts ensuring a very fast installation; moreover, the body parts nestle together allowing an extremely compact packaging with direct implications on freight costs and environmental impact.
What is the minimum soil cover required on top of StormBrixx®?
Minimum soil cover (includes road base and approved backfill material) is 500mm (20in) for pedestrian applications, 600mm(24in) for light vehicular traffic and 800mm(32in) for heavier traffic.
What is the maximum depth StormBrixx® can be installed at?
The maximum depth StormBrixx® can be installed at is usually given by lateral soil (and underground water if present) pressure; the depth when the maximum lateral pressure is reached is usually around 3.5m(11ft) with light traffic and no underground water present. If necessary, there are solutions for deeper installations – please contact ACO.
Can ACO help with the structural design of the application?
Yes, ACO will always provide full structural calculations for the engineer’s review and approval.
Are there any special requirements for the backfill material surrounding StormBrixx®?
Clean, crushed, angular stone, nominal size distribution between 3/4" - 2" (19 mm -51 mm) per AASHTO M43 in 100mm(4in) layer under StormBrixx and 300mm(12in) minimum on the sides. Minimum 100mm(4in) coarse sand or screening on top of StormBrixx®. Roadbase materials above the sand on top of tank to be per engineer’s specification.
Can StormBrixx® be installed on a slope?
StormBrixx® is designed to work on a flat surface, maximum slope of the supporting base should be limited to 2%.
What type of traffic is allowed on the finished surface on top of the StormBrixx® tank?
With the proper design the StormBrixx® tank can sustain H25 loads per AASHTO M306-7 standard.
What finished surface can be used on top of the StormBrixx® tank?
Any finish surface can be used on top of StormBrixx®. The highest load capacity can be reached using a concrete slab over StormBrixx®.
What are the pipe sizes that can be connected to StormBrixx®?
Pipes with diameters between 100mm(4in) and 400mm(16in) can be attached to the side panels, top plate or via access chambers (incorporated in the tank) for purposes such as inlet/outlet, ventilation, maintenance access, etc.
What equipment can be use to compact the cover on top of StormBrixx®?
Up to 6,000lbs vibratory plate compactors can be used to compact the first 300mm(12in) payer on top of StormBrixx®. Small rollers can be used after that ensuring the maximum pressure of 420KN/m2(61psf) is not exceeded.
Can StormBrixx® be used as a tree root growth medium?
StormBrixx® does not have a removable top plate; this makes it more difficult to fill in with soil inside the module. If load carrying capability warrants the StormBrixx® to be used for this purpose than the modules will need to be used on a perimeter around the tree position. StormBrixx® should not be used directly under a tree.
Can StormBrixx® be placed near a foundation wall?
As with any other underground stormwater storage tank it is recommended that StormBrixx® be placed at least 5m(16ft) from any foundation wall.
How is StormBrixx® helping the environment?
Surfaces paved with impervious materials dramatically change the natural balance of the local ecosystem. Besides the pollution associated with the stormwater collected on the paved surface, this water does not infiltrate the soil anymore, but is sent long distances away through a storm sewer system. When used as an infiltration system, StormBrixx® helps re-establish the local natural water cycle by allowing the storm water to get back into the ground, pond or river exactly where it falls and after pollutants were removed from it. When used as a detention/attenuation system, StormBrixx® helps prevent polluted water from infiltrating the ground adjacent to the paved area on which it was collected. When used as part of a rainwater harvest system, StormBrixx® helps reduce the water consumption supplied through the municipal system by using the stormwater for watering the plants or as grey water inside buildings.
Does ACO provide other solutions that integrate with StormBrixx®?
Yes. ACO Environment is a brand that offers many solutions to water management challenges including oil/water separators and other products that integrate with StormBrixx®.
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