Nestled within the majestic hills surrounding Lake Wanaka, the Pembroke Terrace residential subdivision will see the creation of over 140 residential lots, offering 360degree panoramic views over the Upper Clutha Valley and Southern Alps. Due to the 12Ha overall catchment area and number of residential lots, Patterson Pitts Group approached Cirtex about installing a Triton Stormwater System.
DESIGN
The final design by Paterson Pitts Group incorporated over 700 Triton S22 chambers. After looking at initial concepts and offering technical support, Cirtex worked closely with Paterson Pitters Group and Cameron Gibson & Wells to configure the system. Due to the large size of the Triton chambers, the system was able to accept a 750 millimetre diameter pipe to deal with any large-volume stormwater flows leading into the system. The design utilised the Triton main header row, which would take the stormwater from the 750mm pipe and disperse it into each row of chambers.
Prior to installation, Jolly Earthworks processed a series of percolation tests to confirm that the Triton System would function as designed, resulting in council sign-off within 24 hours.
INSTALLATION
Queenstown Lake’s District Council favour the Triton system because of its extensive track record in the region and its ability to be maintained. One of the benefits they have in the region is the porous quality of the locally sourced rock and river pebbles, which is ideal for the Triton System. One of the largest challenges Jolly Earthworks faced was sourcing, crushing and washing enough product to cover the system within the projected timeframe.
Laid over a layer of DuraForce geotextile, the initial layer of aggregate was levelled using a GPS Laser Land Leveller before any of the Triton chambers were installed. Having installed many Triton systems before, Jolly’s key piece of advice is always to invest time making sure the header row and initial column leading from it are squared off to fit the design. Once laid out, installation becomes straight forward, placing several rows of chambers and back filling as you go. Jolly Earthworks expected to have the entire project completed within two weeks.
Requiring a fast, easy-to-install, and extremely cost-efficient stormwater storage solution, the Triton system will provide the residents of Pembroke Terrace stability and peace of mind, no matter the weather, as they enjoy their brand new homes amid the lakes and Southern Alps.
The Triton system used provided the following benefits to the project:
- Large volume storage capacity
- Header row design allows greater distribution
- Quick and easy to install
