Namwon Kim
Korea Institute of Construction Technology
1. Introduction
Korea has experienced extravagant heavy rainfall since the last quarter the 20th century. This experience changed safety criteria and safety concept of hydraulic structures. Typhoon Janis in 1995, a heavy rainfall in 1996 and 1998, typhoon Yanni in 1998, a heavy storm in 1999, typhoon Prapiron in 2000 and typhoon Rusa in 2002 are the main natural storms and flood disasters. The largest damage was 1 billion won by heavy rainfall in 1999 throughout the entire hydrological history, however Rusa brought almost five times more (5.5 billion won) damage than that of 1999 including 246 victims(MOCT, 2003)……
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