| Abstract |
| Accurate rainfall is one of the key inputs to urban flooding numerical models and the lack of gauging stations in some areas has led to consider radar rainfall as an alternative source. In South Korea, radar rainfall is collected by a network of more than 25 stations across the country, updated every ten minutes and made available on the website of the Korea Meteorological Administration (KMA). We compared radar rainfall and observed rainfall for the July 2017 rainstorm event in the Guwol district of Incheon which showed that radar rainfall predicted the rainfall event with higher temporal accuracy but underestimated the rainfall peak. We then used both rainfall inputs to simulate urban flooding with the XPSWMM software and the results showed that using observed rainfall causes increased flooded area, maximum flood depths and number of flooded properties, including an additional flooded area which was reported to have been flooding during the July 2017 event. We recommend that further investigation is carried out for areas located closer to a rainfall gauge or that several rainfall gauges are cross-checked and methods for spatial interpolation of rainfall are applied to back up the results with more certainty. |
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| Key Words |
| Meteorology, Radar rainfall, Rainfall gauge, Urban flooding, 1D/2D simulation |
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