Driving socio-economic development forward in Nepal with resilient road networks – project completion
Nepal’s road networks are essential for boosting trade, connecting communities, improving access to services and economic opportunities, and facilitating national and regional integration. Improving the resilience of Nepal’s roads has therefore been prioritized by the Government of Nepal as a key driver for socio-economic development, a reason the World Bank supported the project Geohazard Risk Management and Resilient Road Asset Management in Nepal. From June 2018 to September 2019, ICEM supported the Government of Nepal through a multi-hazard risk assessment of over 700 km of national roads, and the subsequent development and prioritization of risk mitigation measures to ensure the resilience of these road corridors now and into the future.
Multi-hazard risk assessment and road network criticality assessment
For eight road corridors located mainly in the western region of Nepal, ICEM demonstrated an innovative multi-hazard risk assessment methodology, composed of four risk indices and combining a set of risk parameters such as rainfall, climate change, geology, seismic intensity, slope, drainage and historical landslide events, among others. These four risk indices were consolidated into one “multi-hazard” risk index and formed the basis for assembling a road risk profile per road corridor.
Risk indices developed as part of the multi-hazard risk assessment
Data for each of the parameters were analyzed using GIS and integrating satellite imagery, hydrological and hydraulic modelling results, and expert verification. The data was processed and categorized into five levels of risk ranging from very low to very high risk. For each of the parameters, risk scores were assigned at 1km intervals along all eight target roads, weighted and combined to develop the final risk index […]