Intervention protects the slope leading to a major highway in Calabar
Maccaferri Nigeria implemented a solution using Reno Mattresses and gabions to reduce water velocity and control the erosion which threatened major buildings and a highway in Calabar.
A gully in the Atakpa area was affected by erosion and siltation, which affected the adjacent buildings and a major Calabar highway.
A local consulting engineer was engaged to determine the best solution to protect the slope. A preliminary study was carried out and it was approved by the client, The World Bank.
A weir drop structure was built using a combination of Maccaferri’s products:
- Gabions were used to construct the weir (drop structure) that reduced the hydraulic gradient of the channel, and in turn reduced the energy of the flow and the shear force that the water applied to the channel banks;
- The base of the channel was lined with Reno Mattresses, which addressed the issue of siltation and channeled the water to the existing river;
- MacMat geomats were used to protect the side slopes from occasional hydraulic erosion.. These mats also enable the slope to rapidly revegetate by stopping the topsoil being washed away and providing root reinforcement to the establishing vegetation;
- Maccaferri’s MacTex Geotextiles placed beneath the Gabions and Reno Mattresses hydraulic structure act as a filter layer. The MacTex prevents the wash-out of fine soil particles from beneath the structure by the residual water flow.
By re-establishing vegetation our solutions returned the area back to nature.
For further technical information, please download the Case Study.
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