Water Detention

Aquacomb© on-site detention (OSD) is New Zealand's first in-slab stormwater system to come in a pre-packaged kit form, for simple and quick installation. Our system saves days in construction time and significantly reduces building costs.

The system can be designed into any type of slab construction and is especially suited to waffle pod slabs used in housing. Aquacomb can be located in the slab, deck, lawn, patio and/or driveway. They can go behind retaining walls or even stacked on their edge under soffits. 

Unlike traditional solutions, the entire Aquacomb system is hidden from view meaning no overground pipes and no big, ugly water tanks taking up space on you or your customer's property.

Aquacomb pods are installed by an Aquacomb approved plumber or drain layer to ensure it conforms with the council's stormwater regulations.

Aquacomb© OSD is an established fully modular system, which has completed over 10,000 trouble-free residential construction installations over the past 10 years throughout Australia. It is the problem-solving solution for stormwater issues across Australia and New Zealand.

Advantages of Aquacomb©

No Excavation Costs

Traditional OSD solutions need to be buried in ground. This requires excavation and trucking costs to remove and dispose of dirt, possibly craneage costs to place large tanks, and takes time, money and space.
Aquacomb
© simply replaces the styrofoam pods in your concrete slab or can be located under any hard ground surface like a driveway or under decks, so no extra excavation is needed.

Better Durability

Above ground solutions are susceptible to physical damage from outside forces, and below ground tanks, even if reinforced, can be susceptible to crushing if too much weight is placed over them at any point in their life. Underground tanks also have the issue of 'popping up' out of the ground if the groundwater level rises faster than the tank can fill up.
Rated to withstand 2-tonne external force per unit, Aquacomb
 is both protected from outside forces and is permanently embedded in your concrete foundation so does not move or shift at any stage in its life.

Combined Use System

Aquacomb can be installed in the slab and be used for combined detention and retention. Depending on if you have a larger detention requirement or large retention need you can customise how many Aquacomb pods you allocate each purpose. One product, one system, can fill both needs at the same time.

High Invert Levels

Where there is a high invert level for connection to the public stormwater system, Aquacomb© is the solution as the units are placed at grade, therefore, minimising any issues around achieving appropriate falls required.

What is Water Detention?

Stormwater detention tanks temporarily store rainwater collected from your roof and other hard surfaces on your property after extreme rainfall events and release the water into the council stormwater system at a much slower rate.

Temporarily storing or “detaining” the water and then slowly releasing it over a period of time reduces short term peak outflows from your property and minimises the impact of the water on the local environment, reducing the risk of local flooding.

Since a city has thousands of homes discharging rainwater into the public stormwater facilities, regulations now ensure new homes do not add to this water volume and overwhelm the stormwater system. Councils require a certain volume of water detention capacity but do not require any particular method of achieving it. 

The flexibility of your Water Detention Solution

Aquacomb has a massive advantage over other large water storage solutions in that it is modular and can be tailored to fit virtually any space and any water storage requirements. 


For industrial uses, Aquacomb© is so much easier to install than a single large tank as they can be brought in one by one into any location and arranged in a plethora of ways to best fit your space. Much less engineering is needed when installing Aquacomb© compared to single large tanks, as they can fit into existing infrastructure such as under a floor-slab or car-park.

Concrete or Plastic?

Some people initially think that concrete, being strong and tough, would be the best material to use for water storage. However concrete has many disadvantages over a plastic-like PE.

1) Concrete is porous and will lose water over time. Polyethylene plastic is not porous so water will never escape through the tank walls.

2) PE plastic is much lighter than concrete in any application, meaning a plastic tank is much easier and much cheaper to install than a concrete tank.

3) Polyethylene is extremely inert (non-reactive) so it will never rust or corrode and it can never rot or degrade in place. This also means it is safe for drinking water as the plastic can never flake off or dissolve into the water.

4) PE plastic is 100% recyclable so if it is ever taken out in the future it can be reused or recycled, while a concrete tank would just be smashed and sent to hard fill.

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40,000L Aquacomb installation