1. In order to avoid great losses and fatality affected by flooding, an evacuation route is to be found out.
2. A study of non physical mitigation, i.e. to establish some alternatives of evacuation routes to some temporary shelters is to be conducted well in advance.
3. A research on the selected several evacuation routes, with the help of Geographic Information System (GIS) can be done.
4. The research can be conducted by analyzing the flood magnitude, inundation area, population density, settlement concentration, temporary shelter locations, topographic condition and existing road system.