On July 9-10, 2006, the third typhoon of the season, Ewiniar, developed in the sea approximately 1,010 km southwest of Guam, and headed towards the southern part of Korea (including the South Gyeongsang and South Jeolla regions), gathering enough force to become a strong mid-scale typhoon with a central air pressure of 985 hPa and a maximum wind speed of 31 knots, accompanied by strong winds and localized torrential rains. At that time, there was rainfall measuring 401mm in Namhae, 373.5mm in Geoje, 366mm in Sancheong, 306.5mm in Jinju, 296mm in Yeosu, and 276mm in Goheung.
From July 11-29, but chiefly on July 11, the seasons fourth typhoon, Bilis, which eventually landed in China, caused a vapor mass to form in the atmosphere while a rain front was moving up and down the middle part of the country after having lingered over North Korea. As a result, 500-900mm of rainfall was reported in the mountainous Gangwon-Yeongseo region, while the rain front moved downward to the southern half of the peninsula (reaching the southern part of Gyeonggi Province), and localized heavy rain fell in Gyeonggi, Anseong, Yeoju, Jincheon (North Chungcheong Province), Eumseong, Danyang, and other areas. From July 11 to 13, heavy rain fell in Seoul, Gyeonggi, and the northern part of Gangwon Province. From July 14 to 20, there were heavy rains in Hwoingseong (921mm), Pyeongchang (870mm), Hongcheon (851mm), Donghae (729mm), Jeongseon (716mm), and Inje (679mm). From July 25 to 29, heavy rain fell reported a rainfall of 359mm, Eunseong 383mm, Jeocheon 359mm, Suwon 337.5mm, Yangpyeong 286mm, and Chungju 228.5mm.
Cause of the Disaster
Typhoon Ewiniar caused drainage problems at major lower streams in Gimhae, Jinju, and coastal areas like Yeosu and Boseong, which consequently resulted in the inundation of streets and roads. Meanwhile, mountainous areas like Sancheong and Hapcheon suffered damage to public facilities as a result of the heavy rainfall (in excess of 300mm), but the damage was relatively less than that caused by previous typhoons, such as Maemi and Rusa, owing to significant reconstruction and restoration that had been done after those earlier disasters. Numerous mudslides were caused by the intensive rainfall because the soils foundation became excessively saturated due to the prolonged period of heavy rains (from July 11 to 29), which also aggravated the flooding caused by the typhoon in the basin of Nanhangang River in Yeongwol, Danyang, and Yeoju. Furthermore, the solifluction caused by the intensive rainfall and subsequent mudslides in the mountain areas aggravated the damage caused by the typhoon, resulting in the loss and burial of mountainous backwater areas. Moreover, the solifluction clogged streams, flooded bridges, inundated streams, and caused embankments to collapse, wreaking havoc on houses and farmland and washing out roads. In the mountain areas, national and local roads were destroyed due to the solifluction and mudslides in the ravines and road-cut slopes. In Pyeongchang, farmland soil was washed into the streams, aggravating the inundation caused by the flood.
On July 9-10, the third typhoon, EWINIAR, was generated in the sea approximately 1,010 km southwest of Guam, the United States, and headed towards the southern part of Korea (Gyeongnam, Jeonnam, etc.), gathering enough force to become a strong mid-scale typhoon with a central air pressure of 985 hPa and a maximum wind speed of 31 mk, accompanied by strong winds and locally intensive rainfall. At that time, Namhaes rainfall measured 401 mm, Geojes 373.5 mm, Sancheongs 366.0 mm, Jinjus 306.5 mm, Yeosus 296 mm, and Goheungs 276 mm.
On July 11-29, but specifically on July 11, the fourth typhoon, Bilis, which eventually landed in China, caused a massive vapor to form in the atmosphere while the rainfront was moving up and down the middle part of the country and stayed over North Korea. As a result, 500-900 mm of rainfall was reported in the Gangwon-Yeongseo region, which is a mountainous area, while the waterfront moved downward to the southern part of the country (e.g., the southern part of Gyeonggi-do) and locally intensive rains fell in Gyeonggi, Anseong, Yeoju, Jincheon in Chungbuk, Eumseong, Danyang, and others. On July 11-13, heavy rains fell in Seoul, Gyeonggi, and the northern part of Gangwon-do. On July 14-20, heavy rains fell in Hwoingseong (921 mm), Pyeongchange (870 mm), Hongcheon (851 mm), Donghae (729 mm), Jeongseon (716 mm), and Inje (679 mm). On July 25 to 29, heavy rains fell over Anseong in Gyeonggi-do, and again in Danyang, Chungbuk. Jecheon reported a 359 mm rainfall, Eunseong 383 mm, Jeocheon 359 mm, Suwon 337.5 mm, Yangpyeong 286 mm, and Chungju 228.5 mm.
Typhoon EWINIAR caused problems with the drainage at the major lower stream in Gimhae, Jinju, and seashore areas like Yeosu and Boseong, which consequently resulted in the inundation of streets. Meanwhile, mountain areas like Sancheong and Hapcheon suffered damages to public facilities as a result of the intensive rainfall (exceeding 300 mm), but the damage was relatively smaller than that caused by the previous typhoons, such as Maemi and Rusasi, because much reconstruction and restoration had been made. Many mudslide incidents were caused by intensive rainfall because the earths foundation contained excessive water due to the long period of heavy rains (from July 11 to 29), which also aggravated the inundation caused by the typhoon in the basin of Nanhangang River in Yeongwol, Danyang, and Yeoju. Furthermore, the solifluction caused by the intensive rainfall and the subsequent mudslide in the mountain areas aggravated the damage, resulting in the loss and burial of the mountainous backwater area. Moreover, the solifluction clogged the river stream, flooded the bridges, inundated the river stream, and caused the collapse of embankments, wreaking havoc on houses and farmlands and wiping away roads. In the mountain area, national and local roads were destroyed due to the solifluction and mudslide in the valleys and road-cut slopes. In Pyeongchang, farmland soil was flown into the river stream, aggravating the inundation caused by the flood. Much of the damage caused by typhoon EWINIAR from July 9 to 10 consisted of the inundation of streets due to the problem with the drainage at the lower stream of the major rivers. On July 11-29, intensive rainfall was caused by the fourth typhoon, Billis, which hit China while the rainfront was moving up and down the middle part of the country and stayed in the northern side of the Korean peninsula on July 11.
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| Summary of Damage to Metropolitan Cities and Provinces (July 9-29, 2006) |
Metropolitan Cities
& Provinces
|
Total Damage(unit: millions of KRW) |
Disaster victims
(Persons)
|
Lives lost
(Persons) |
| Seoul |
5.734 |
73 |
- |
| Busan |
8.616 |
34 |
1 |
| Daegu |
737 |
5 |
- |
| Incheon |
713 |
21 |
- |
| Gwangju |
45 |
8 |
- |
| Daejeon |
68 |
8 |
- |
| Ulsan |
19.581 |
8 |
1 |
| Gyeonggi Province |
57.671 |
57 |
8 |
| Gangwon Province |
1,308,779 |
2,078 |
44 |
| North Chungcheong Province |
94,883 |
105 |
3 |
| South Chungcheong Province |
14,879 |
55 |
- |
| North Jeolla Province |
1,905 |
39 |
2 |
| South Jeolla Province |
43,425 |
93 |
- |
| North Gyeongsang Province |
52,337 |
118 |
3 |
| South Gyeongsang Province |
221,966 |
85 |
- |
| Jeju Province |
2,088 |
3 |
- |
| TOTAL |
1,834,428 |
2,790 |
62 |
|
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Information : Administrative Management Division / Woo So-Young /