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Summer Specials now on!
Following Cyclone Tam (April 2025) and a subsequent heavy rainfall event (May 2025), a slip was assessed by KiwiRail Asset Team on the eastern downslope of the rail embankment at 220.045km North Auckland Line (NAL) along the State Highway 1 (SH1) in Whangarei.
The Upper North Island (UNI) Asset team, together with the KiwiRail Engineering team (Civil Geotechnical), looked into design solutions to mitigate the impact of the slip. Based on previous projects undertaken as part of the Auckland Flood Recovery, cost consideration, and long-term resilience, a Mechanically Stabilized Earth (MSE) retaining wall using FlexMSE®geomodular facing was recommended as the preferred option.
Based on improved construction cost, finished green face, and greater resilience with reduced maintenance, Flex MSE was chosen as it offered the unique ability to combine engineering performance and infrastructure needs with environmental restoration. Engineered to meet seismic requirements (up to 0.15g), this system provided structural integrity and sustainable performance, helping reduce stormwater runoff and erosion. Supporting long-term plant growth, Flex MSE achieved a reduced visual impact with a vegetated green finish that blends into the natural surroundings.
The FlexMSE geomodular block and interlocking plate system is covered with a 75-year warranty, and a rated lifespan of 120 years. The constructed retaining wall in this project measures 3.5 meters high by 25 meters long, using 1120 Flex MSE bags and plates to complete.
The bags were hydroseeded post-construction with FlexTerra High Performance Fast Growth Mulch (HP-FGM).
Advance Landscape Systems were pleased to work with KiwiRail engineers, local council in Whangarei and Waka Kotahi to find an appropriate solution for this project. The site is adjacent to SH1 Kamo Whangarei – referred to by KiwiRail as NAL 220.045 (North Auckland Line 220.45km from Auckland).
Advance Landscape Systems are the exclusive New Zealand distributors for FlexMSE. If you are interested in this system, please get in touch with our Consultant, Matthew Strachan.
Our trade account customers enjoy regular purchasing options with prompt service and competitive trade pricing. They also gain access to our exclusive, customised products tailored to their needs. Conditions apply to qualify for a trade account — contact our team today to learn more!
For large projects or landscaping jobs, you can easily submit a bulk pricing request. Our team will review your needs and get in touch with a tailored quote. We’re here to help you get the best value for your project.