Site
Kayelene Place, Ōmokoroa
Specifier
Maven
Contractor
CB Civil
Description
The Filterra® Bioscape is a collaborative approach with stakeholders to deliver a water-sensitive design solution that is only a fraction of a traditional rain garden. This is showcased at the Kayelene Place site in Ōmokoroa collaborating with Maven and CB Civil to deliver a great solution in a tight space where conventional systems wouldn’t fit.
While the footprint is smaller, the site has a lot of challenges and restrictions. Consideration has to be taken during design since the Council Stormwater reserve is right next to the stream as the receiving environment, high rainfall events can increase the water level on the stream and surcharge into the Filterra® Bioscape system. Future water level rise can also surcharge into the Filterra® Bioscape system. Raising the Filterra® Bioscape can also cause flooding on the upstream catchment so had a restricted level where the Filterra® Bioscape can fit. There is also a flooding risk on the Stormwater Council reserve, a high bund was designed to prevent any flooding from washing/scouring the system.
BENEFITS OF THE FILTERRA® BIOSCAPE:
Originally the treatment system specified was a Rain Garden and Swales. The original Rain Garden footprint needed to be approx. 1,315m². The council-owned
stormwater reserve land was not big enough for the 1,315m² of rain garden. Also, the Rain Garden had to be installed next to the road, however, since the roads are
next to steep land, the rain gardens need a structural retaining wall which increases the cost significantly.
The specified Filterra® Bioscape only needed 205m² of footprint, which now can be fitted solely in the Stormwater Council reserves.
The Filterra® Bioscape can treat at the same level as the Rain Garden but at a fraction of the footprint.
The single location of the system and reduced footprint reduce the cost of maintenance and overall lifecycle to the council.
Using native plants on the Filterra® Bioscape to promote Te Mana O Te Wai.
Working with the council, we will install a display to educate the local community on what the system is for and create ownership with the community.
TARGET CONTAMINANTS AND MAINTENANCE:
Targeting sediment, heavy metals and nutrients.
The maintenance is simple and easy only requiring the replacement of the layer of mulch on top every 6 months.
