Asia - Vietnam 
Challenge
Northern Vietnam faces floods, landslides, and erosion that repeatedly damage rural roads, slopes, and riverbanks during intense wet-season rainfall.
Solution
The project applied vegetation-based bioengineering to stabilize slopes and riverbanks, reduce repair costs, and maintain infrastructure with local labor and materials.
Overview
Northern Vietnam’s mountainous provinces rely on roads, irrigation systems, and riverbanks to support agriculture, market access, education, healthcare, and water supply (ICEM, 2017). These systems are repeatedly damaged by floods, landslides, and erosion during the wet season, which runs from May to September and delivers more than 80% of annual rainfall. Annual precipitation often exceeds 1,200–1,700 mm, depending on the location. Climate change intensifies rainfall events, increasing pressure on fragile infrastructure and creating recurring repair costs for local governments and communities.
Against this backdrop, bioengineering approaches were applied through the project “Promoting Climate Resilient Rural Infrastructure in Northern Vietnam,” implemented with the Ministry of Agriculture and Rural Development and the Asian Development Bank, with funding from the Global Environment Facility Special Climate Change Fund. Vegetation-based measures combined with simple structures can protect roads and riverbanks while remaining affordable and manageable at the community level.
Climate risks and infrastructure vulnerability
Steep terrain and erodible soils increase exposure to landslides and slope failure. Riverbank erosion threatens farmland and settlements, while damage to rural roads disrupts trade, access to services, and local economic activity. Concentrated rainfall during the wet season places sustained stress on drainage systems and unprotected slopes, leading to repeated damage in the same locations.
Bioengineering measures and demonstration sites
Bioengineering measures were applied at four demonstration sites across three provinces, using natural vegetation, particularly Vetiver grass, together with simple structural elements such as palisades (vertical stakes forming a defensive wall) and gabions (rock-filled wire cages for structural support).
In Phong Lap commune, Son La Province, Vetiver grass planting and palisades were installed along a 102-meter roadside slope. Costs ranged from 8.9% to 21.3% of conventional engineering approaches.
In Lien Minh commune, Thai Nguyen Province, live fences and brush layers stabilized cut and fill slopes along a rural road. Costs ranged from 8.9% to 25.5% of traditional methods.
In Thanh Mai commune, Bac Kan Province, seven bioengineering techniques were applied to protect 106 meters of riverbank supporting nearby agricultural land. Costs were about 40% of conventional concrete revetments.
In Thom Mon commune, Son La Province, gabions combined with Vetiver grass stabilized a 111-meter stretch of riverbank. Costs ranged from 9.5% to 22.8% of conventional solutions.
Community participation and capacity building
Local residents took part in construction and maintenance at each site. Training covered planting techniques, installation of simple structures, and ongoing upkeep using locally available materials. This approach built practical skills and encouraged local responsibility for maintaining the measures after construction.
Using local vegetation reduced material costs. Together with construction and maintenance activities, this helped support long-term sustainability and economic benefits within the participating communities.
Adaptation outcomes and implications
The cost difference between bioengineering and conventional approaches is substantial. Bioengineering methods cost a fraction of traditional solutions and reduced repeated repair needs following flood and erosion events. In some locations, reported savings reached up to 90% compared with conventional engineering, while still reducing erosion and flood risks through vegetation-based stabilization.
Community participation also supports durability. The participating communities gained skills needed to maintain protective measures, supporting continued use beyond initial construction and strengthening local capacity to cope with climate-related hazards.
Acknowledgements
This report draws from work by the International Centre for Environmental Management (ICEM) and Philkoei International, Inc. (PKII), detailed in the report “Promoting Climate Resilient Rural Infrastructure in Northern Vietnam.” Acknowledgement is given to the original authors. Reported by IGES, edited and updated by AP-PLAT.
Related Information
Viet Nam: Promoting Climate Resilient Rural Infrastructure in the Northern Mountain Provinces https://www.adb.org/projects/41461-042/main
Climate-resilient Infrastructure in Northern Mountain Province of Vietnam
https://www.thegef.org/projects-operations/projects/3103
ICEM: Promoting Climate Resilient Rural Infrastructure in Northern Vietnam – Project Description
https://icem.com.au/portfolio-items/vietnam-resilience/
ICEM. 2017. Promoting Climate Resilient Rural Infrastructure in Northern Vietnam, Progress Report 15: Final Report. Prepared for the Ministry of Agriculture and Rural Development and Asian Development Bank. Hanoi.
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