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Requirement
WRPI completed the national Flood Inundation Map update work (the first update) in 1996. Since the basic data, simulation conditions, and calculation models required for Flood Inundation Map production are different, it is difficult to integrate and improve the accuracy of the Flood Inundation Map. Therefore, WRPI began to revise the "Flood Inundation Map Production Manual" in 2013. WRPI has followed the standard operating procedures to simulate the flooding depth and impact area under different rainfall conditions and produce a stable and reliable Flood Inundation Map. The map can be used as a reference for the disaster prevention of the government and can be integrated and applied in the future.
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Process
The second generation upgrading of Flood Inundation Map was based on the contents of the "Flood Inundation Map Production Manual". According to the 19 counties and cities' Flood Inundation Map have gradually completed from 2014 to 2016, It was publicized by the MOEA in 2018.
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Results
The third generation of Flood Inundation Map has different rainfall conditions, including 6 hours 150 mm, 250 mm, 350 mm, 12 hours 200 mm, 300 mm, 400 mm, 200 mm within 24 hours, 350 mm, 500 mm, 600 mm. There are ten quantitative rainfall scenarios. For example, if the rainfall is 500 mm in Yunlin County, the Flood Inundation Map is shown in Figure 1.
Figure.1 Rainfall 500 mm in 24 hours Flood Inundation Map(Example of Yunlin County)