The Kirimoko Park development is an acclaimed residential eco-subdivision project in Wanaka that incorporates unique landscape, urban architecture and low impact design (LID) principles.
AR & Associates have been responsible for the engineering design of the roading and infrastructure elements from the beginning of the second stage through to the completion of the fourth and final stage of this 129-lot subdivision development.
This development has a strong focus on sustainability, and one of the key principles of the design involved Water Sensitive Design (WSD) philosophies.
From the start of the project, Kirimoko Park was conceived and developed with a fully integrated approach in mind, where the urban design and landscape elements took shape in full recognition of WSD principles and other design considerations. This resulted in a seamless, coherent design that has achieved the highest standards of quality, engineering resilience and functionality, and a truly unique aesthetic value.
WSD concepts that have been adopted for this development include:
- Earthworks were essentially limited to the formation of road corridors, where the roads followed a curvilinear alignment along the contour of the land and where bulk earthworks were avoided.
- Introduction of a network of grass and rock feature swales and channels which replaced piped systems for the conveyance of primary flows. Swales result in a more economical stormwater design which is also more robust, resilient, environmentally friendly (through the filtration properties offered), and easier to maintain.
- The use of natural ground depressions for the provision of stormwater detention and infiltration areas and to promote the control of stormwater peak discharges and volumes, thereby maintaining natural runoff patterns and minimising changes to the hydrological regime.
ARAL’s role in the project included the overall civil engineering design of the subdivision, including roading, earthworks, stormwater, wastewater, water supply and utility services. As mentioned above, the design was heavily influenced by WSD design philosophies. This turn resulted in a superior urban environment with shared use spaces and with passive traffic calming measures, achieved through the curvilinear nature of the roads and the use of fords for the conveyance of flows across sag points, integrated with bespoke urban design elements.
The design resulted in positive environmental outcomes enabling Kirimoko Park to meet its sustainable development principles. There were five key sustainable initiatives promoted including:
- Maintaining the original landform to keep the existing natural geology and topsoil, creating a unique shared use road network for pedestrians and cyclists.
- Contaminant removal through water treatment- using swales, raingardens, detention basins to promote biofiltration.
- Managing peak flows prior to discharging offsite through the promotion of dispersed flow patterns and avoidance of concentrated discharges, increasing infiltration onsite.
- Minimising earthworks wherever possible by using the original landform, and curvilinear road corridors. Reducing any sediment discharge offsite and need for disposal.
- The introduction of a Kirimoko Sustainability Code for residents where they are encouraged to use local and environmentally friendly building products, and to follow and uphold sustainable development initiatives to minimise the environmental footprint of the project.
The final result has been well received by Council and residents alike, with Kirimoko Park being recognised throughout NZ as a one of a kind, highly attractive and sustainable development.