Methodology for future flood assessment in terms of economic damage: Development and application for a case study in Nepal

To address the lack of adequate measures for flood risk reduction in Nepal, where recurrent flood-related hazards have had grave consequences for many people over the past decades, the authors developed a flood risk assessment model for a study area in the Sindhupalchok District. The model considers direct and indirect damages that are assigned to four asset categories (hydropower plants, roads, houses, and farmlands) and two scenarios (low-exposure-low-flood and high-exposure-high-flood scenarios).

Model results indicate the following:

1. the planned expansion of hydropower plants reflected in the high exposure scenario is responsible for a substantial increase of economic damage compared with the low scenario, and
2. for both scenarios, flood damage is largely related to road closures, which result in the loss of income for villagers and the loss of customs revenues.