Quantitative Flood Risk Assessment in Drammenselva River, Norway

Floods are frequent natural hazards, triggering significant negative consequences for the economy every year. Their impact is expected to increase in near future due socio-economic development and climate change. In order minimize probability magnitude of economic losses compensation costs, it essential that flood risk managers properly informed about potential damage related hazard features exposure. this paper, a estimation method was proposed assessment Drammen River basin by using hydraulic model, GIS, loss model. Hazard variables such as depth, extent, velocity were computed current climatic scenarios model assessment. To visualize velocity, their impact, results modelling illustrated form inundation maps produced GIS. A estimate included buildings other infrastructure major exposures flood-prone areas. The formulated based on stage–damage relationships between different depths land-use categories. It calculates simulated parameter obtained from 100- 1000-year return periods. For case study, show highest proportion total each repetition interval (approximately 90–92%) occur buildings. addition, showed effects change will raise floods 20.26%.