A 3D simulation of river basin boundary based on the change of water-level using open government data in South Korea

South Korea has recently been suffering from damage caused by typhoons and floods. To reduce repetitive damage, the government has drawn up a trace of flood damage through surveys. However, due to the number of hours of time, cost and manpower, only major areas are being made. Therefore, the purpose of this study is to create 3D simulation that is relatively easy to make and identify areas of flood risk using open government data. The study area is the Taehwa river basin in Ulsan, which was influenced by typhoon ‘Chaba’ in last year. The stages of River level were set up by examining the actual rainfall and the river level. River basin were simulated in 3D at each river level using 1/1000 digital map. The result of this study can be used as references for disaster prevention planning and impact assessment of pre-disaster at the national level and for maintenance of facilities and the selection of shelters against typhoons and floods at the local government level.