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A gabion lined water course / wetland flow path was required for 1 in 100-year storm events for this new residential development. The channel is designed to cope with high water flow in heavy rain events hence the need for protection of the channels side walls using genuine Maccaferri gabion baskets.  Under normal site exposure Maccaferri Galmac/PVC coated double twist wire Gabions have BBA certification of up to a 120-year working life.

Approximately 400 2x1x1 m and 240 2x1x0.5 m Galmac/PVC coated double twist wire gabion baskets were installed by a six person team over a three month period. Some weather delays were experienced in the construction phase, but speed of installation was significantly increased due the use of two Geofabrics hired pneumatic lacing tools.

1,200 m2 of Bidim A29 non-woven geotextile was placed under and behind the gabion structures to prevent migration of fines from backfill or excavated soil walls.

Maccaferri Gabions are a durable and adaptable option for soil erosion and bank stabilisation projects. When laced together the gabions provide a flexible monolithic mass gravity retaining structure that can accommodate differential settlements. Maccaferri Gabions can withstand high shear stresses and earth pressures and can be easily adapted to site conditions.

They offer an environmentally friendly retaining solution with low installation costs. Because of the high permeability of the rock filled gabion baskets, any potential for hydraulic pressure build up behind the retaining wall is virtually eliminated adding to the overall stability of the structure.
Careful placement of rock fill in the outer exposed faces of the gabion baskets can also provide an aesthetically pleasing finish as shown in this project.   

Download the Case Study

Manukau Golf Course Residential Development Hydraulic Structures

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