Debris Flow Barriers

In 2008, an incident of debris flow with approximately 4,000m³ of mud soil had flowed down hill to highway of Sections 62-4 to 62-8 along Simpang Pulai Road (Laluan FT185) in Lojing, Gua Musang, Kelantan. The height from toe to the debris source was about 260m, with slope gradient ranged from 20°to 35°. It was anticipated that the risk of debris flow re-occurrence at the same location was high and estimated to be 5,000m³ in volume. Hence, the Authority was looking for engineered barriers to be installed along the anticipated flow path to retain or retard the debris flow, in order to minimize the risk of debris reaching the highway.

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In recent years, Malaysia has experienced frequent debris flow event especially along road and highway located on mountainous terrain. This case history describes channelized DFB project in Malaysia. Site is characterized by descending steep channel with rock outcrops on the channel. The debris snout has modified the existing channel alignment one. Mitigation works were required to reroute the channel back to its original alignment and protect the existing switchyard from future debris flow event. It provides cost effective solution, especially in challenging and difficult terrain. They are light and easy to install. The structure itself is transparent and fit better into the landscape.

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Lake Komani in Bajram Curri, Albania, was constantly threatened by debris flow from Lerini-Salca stream, growing this way the water level in the lake and giving the dam additional and artificial charges, also separating the lake in two parts. The strong water flows generated this way were creating difficulties for the ship which sail in the lake.

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