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When Gravity is an issue

Finding the perfect section of land in Auckland isn’t easy but APD’s DnP solution was able to help this family build their dream home on a not so perfect plot. A plumbing station was needed on a property situated down a steep driveway in Blockhouse Bay. It needed to be able to capture and remove up to 1,200L of waste water but gravity posed an issue.

Our Task

We were asked to provide a tank that could capture up to 1,200L of waste water from the house and pump it up hill to join with the council system located at road height. APD had worked with Max Plumbing before so they already knew we had the perfect solution.

Our Solution

The DnP waste water pump – an underground tank and pump that would provide everything required. The reasons they chose this solution were:

DnP is made of PE which has a longer lifespan than concrete solutions

Plug in and Play

Right from the beginning our team listens to your needs and requirements before building the tank to order. By the time it gets to site it is ready to into the ground and connect up to the properties waste water system. Leading to a straight forward, time saving installation without messy concrete or complicated instructions. Don’t worry if you do get stuck though, our helpful team are available to support you if you need it.


Meaning that they were able to build their dream home on a peace of land that otherwise would have struggled to support the plumbing requirements of a family home.

Under-house Stormlite Detention Tank


APD StormLite® Detention and Retention tanks can be installed under house or decks where space permits. Key requirements for this type of installation are for the tanks to not undermine any of the structural support of the building or for the tanks to be placed anywhere that a surcharge load can be applied to them by the building structure.


If the tanks are not to be completely buried then the minimum burial depth for the tanks is half the height of the cylindrical tank diameter. The tank shown in these images is a 1000mm diameter tank and it has been buried to a height of 500mm from the tank invert.

Rectangular tanks for a tight spot – “The Block” Houses

Our Task

This small site where the 4 Block NZ villas stand, rests at the foot of Mount Albert. When the engineers determined that the site coverage of the villas would require detaining 15,200L of storm water they knew they couldn’t dig down and they didn’t have space for circular above ground tanks.

Our Solution

We calculated that the most suitable and cost effective solution would be to position 2x 2,000L Stormlite® tanks* under villas 1,2 & 4 and to place two slightly smaller tanks under villa number 3 (which had the greatest space restrictions in the foundation layout). Concrete beds would form the base for the tanks to rest on and special PE strips were used to position the tanks without scraping or damage. Access hatches to the Stormlite® tanks were included in the deck designs to allow for straightforward maintenance while the tanks remained discretely out of sight, as seen in the final photo on the right. *The choice to split into two tanks was to work within spaces between the foundation piles.


Meaning that the block builders could have peace of mind and focus on everything else they needed to deliver.