The purpose of this paper is to provide information on disasters caused by Typhoon Morakot in Taiwan. The torrential rainfall is regarded as the main cause, so information on the torrential rainfall is explored first. The maximum cumulative rainfall depth observed during Typhoon Morakot approached the world’s greatest point rainfall record, and isohyets of cumulative rainfall depth are included, together with storm centers. Storm centers are important to disasters resulted from Typhoon Morakot, because these disasters occurred around or downstream from storm centers. Disasters triggered by Typhoon Morakot include floods, landslides, landslide dams, driftwood accumulation, and water supply disruption. Those occurring simultaneously or consecutively at one location are termed “compound hazards.” Current warning systems for single disasters may not be sufficient to handle compound hazards, suggesting that we must develop new systems for issuing early warnings about compound hazards.

1. [1] Central Weather Bureau, Taiwan, “Historical Typhoon database,” 2009.
   http://rdc28.cwb.gov.tw/data.php.
2. [2] C. L. Shieh, C. M. Wang, W. C. Lai, Y. C. Tsang, and S. P. Lee, “The composite hazard resulted from Typhoon Morakot in Taiwan,” Journal of the Japan Society of Erosion Control Engineering, Vol.62, No.4, pp. 61-65, 2009.
3. [3] Water resource agency, Ministry of economic affairs, Taiwan, “Dreading and restoration after Typhoon Morakot,” Water resource agency, Ministry of economic affairs, Taiwan, 2009 (in Chinese).
4. [4] World Meteorological Organization, “Guide to hydrological practices,” WMO-No 168, Fifth edition, World Meteorological Organization, 1994.
5. [5] Water resource agency, Ministry of economic affairs, Taiwan, “Study on riverbed variations and flood preventions of Tsengwen river and Yanshuei river,” Water resource agency, Ministry of economic affairs, Taiwan, 2005 (in Chinese).