Maccaferri Indonesia provided river bank protection and erosion control systems including Gabions, Reno Mattresses and MacTex MXL for a project in the Way Ara, Indonesia.
Way Ara is located in the South of Seram Island, Maluku Province of Indonesia. An unconfined river body was threatening the surrounding areas, populated by the local community, with frequent floods coming during the rainy season. Given this, Maccaferri was asked to provide substantial river bank protection measures to mitigate potential future hazards to the local community and the environment.
The objective of the project was to build a dike to confine the high water flow level to avoid flooding of the areas in its vicinity. The dike was planned to be constructed with locally available loose soil (mainly sandy clay) to both lower the cost of the installation, reduce the import of offsite materials and ensure the sustainability of the project.
The Public Works Department decided therefore to build the wall and to cover it with a durable and flexible revestment system to prevent the erosion of the fine soil particles. Project designers decided to line the dike using Gabions and Reno Mattresses coupled with concrete blocks.
Gabion baskets are made from high-quality steel wire, which is heavily galvanized to provide long-term corrosion protection. An additional protective polymeric coating is also applied for gabions that are to be used in more aggressive environments, or where a longer design life is required. For the project in question, Maccaferri chose to use Gabions also as they can quickly be filled with locally available offsite material, thus making them a highly cost-efficient and user-friendly solution.
Reno Mattresses allow for tangential river flow velocities of up to 6m/s to flow without any substantial damage (according to the test results gathered during the Colorado State University hydraulic test campaign). Mattresses are also very flexible modular elements which allow high levels of deformation and settlements without compromising the lining integrity. During the construction phases, the Mattresses lining experienced a severe flood without any visible damage. Reno Mattresses have shown to be a valid alternative to the traditional coating systems used in Indonesia (rip-rap or masonry walls) in the way of flexibility, durability and cost effectiveness.
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For more technical details, please download the Case History.