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Sediment-related Disasters in the world : 2011

2011/1/1 - 2011/12/31

Date of occurrence Country Type Summary
Jan. 12
Brazil Collapse, Debris Flow In Teresopolis, a town about 100 km northeast of Rio de Janeiro, the capital of the state of Rio de Janeiro in the Southeast region of Brazil, hillside collapses simultaneously occurred everywhere in the surrounding area due to the continuous heavy rainfall that had started on Jan. 11. Debris flows directly hit the houses at the foot of the mountain. Debris flew into the village. Combining the casualties in Nova Frigurgo, Petropolis, and other nearby towns in the same state, a total of 806 people died, making this the worst disaster in the history of Brazil.
Jan. 1-31 Philippines Debris Flow, Collapse A rain front stalled throughout January, causing torrential rainfall particularly during the periods of Jan. 5-8, 15-23, and 26-31. This caused frequent collapse and debris flow disasters in southern Luzon, Leyte, Visayas, Mindanao, and other islands. In St. Bernard in southern Leyte Island, a collapse killed 3 children and injured 8 people. In Caraga Island, a collapse killed 2 and a debris flow killed 2. Including these, debris flows and collapses killed 3 and 6 nationwide, respectively, making a total of 9 deaths with 10 injured and 3 missing. When damage from floods and storm surges are included, the death toll rose to 75 with 22 missing and 13 injured. Affected were 2,200 villages, 400,000 households, and 2,000,000 people, of which 140,000 households and 680,000 people evacuated.
Feb. 27 Bolivia Landslide Continuous rainfall lasting for weeks in the Valle de Las Flores district of southern La Paz caused a massive landslide on February 27, completely destroying hillside roads and about 400 roadside houses. By appropriate evacuation efforts before the slide, there were no casualties except for a few minor injuries.
Mar. 10 Indonesia Debris Flow In Tangse in the mountainous area of Pidie district, Nangro Aceh Darussalam province, West Sumatra, showers in the evening of March 10 caused a debris flow, washing away several houses and killing 21 people.
Mar. 11 Japan Landslide At 14:46 on March 11, a M9.0 earthquake jolted Honshu island of Japan from the Tohoku region to the northern Kanto region. A tsunami caused catastrophic damage to the coastal area. Besides the tsunami, the mountain areas suffered 6 cases of debris flows, 15 cases of landslides, and 60 cases of collapse, adding up to a total sediment-related disaster of 81 cases. A landslide in Hanokidaira, Shirakawa City, Fukushima Prefecture, completely destroyed 10 houses and killed 13 people. A landslide in Kawanishi, Nasukarasuyama City, Tochigi Prefecture, killed 2 people. A collapse in Tabitomachi Ishizumi, Iwaki City, Fukushima Prefecture, killed 3 people. The total death toll was 19.
Apr. 22 Philippines Landslide In the early hours of April 22, a landslide occurred near a gold mine in the mountain of Kingking, Pantukan, Compostela Valley province, south Mindanao Island, Philippines, due to heavy rains, killing 43 people. Illegal mining and deforestation had caused to weaken steep slopes.
Apr. 24 Venezuela Debris Flow In a valley near Bolivar, Yaracuy state, northwest of the capital Caracas, a debris flow occurred due to sudden intensive rainfall. Some families enjoying a picnic were affected, and at least 9 people died.
May 6 Indonesia Collapse After days of continuous rainfall, three villages in Garut, West Java, suffered inundation damage. In Cagadog village, Cikelet, a collapse occurred, and 19 people were buried in debris and confirmed dead.
May 9 China Collapse At around 1 PM on May 9, in Luojiang village, Quanzhou county, Guangxi Zhuang autonomous region of South China, a quarry slope collapsed due to days of continuous heavy rainfall. As a result, the workers dormitory was buried and 22 people died. The debris filled as wide as two basketball courts, with a thickness of 5 m and a volume of 250,000 - 300,000 cubic meters.
May 21 Malaysia Collapse At around 2:30 PM on May 21, a collapse occurred in Hulu Langat, Selangor state, south of the capital Kuala Lumpur, due to two days of continuous heavy rainfall. The debris hit a hillside orphanage (with 49 boys and 5 staff members), killing a total of 16 people (1 staff member and 15 students) and injuring 10.
July 1 Bangladesh Landslide Slightly after 6:30 AM, a landslide occurred in the Bata lee Hill district near Chittagong city due to continuous heavy rain that had started on the previous day. This destroyed slope-retaining walls, buried several houses, killed 17 people, and injured 2.
July 7 Nepal Collapse, Debris Flow Due to continuous monsoon rain that had started in late June, floods, collapses and debris flows frequently occurred in 14 zones, particularly in the southern Terai plains, leaving at least 65 people dead and 24 people missing. As of July 7, the breakdown was 6 in Kaski, 5 in Achham, 5 in Tanahu, 5 in Palpa, and 4 others.
July 18-23 Bangladesh Debris Flow From July 18 to July 23, multiple debris flows occurred in 7 villages in the vicinity of Cox's Bazar near the southern tip of Bangladesh. As a result, 10 people died, 1 was injured, and 3,897 houses were completely destroyed.
July 25 Ecuador Landslide At around 8:45 PM on July 25, a landslide occurred in the town of Fama, Sucumbios province, near the border to Colombia. Seven people, who stayed inside houses, were burried and died. An 8-day-old baby was rescued from the debris.
July 26-28 South Korea Landslide, Debris Flow Between July 26 and 28, stationary front activities intensified mainly in Gyeonggi-do and Gangwon-do in the northern part of South Korea, causing torrential rain and recording a total precipitation of 500 - 680 mm. Southern Seoul had 113 mm/h of rainfall in the early hours of July 27. This caused flood around the Han River and its tributaries, killing 52 people and inundating about 10,000 houses. Some 5,000 households and 11,000 people were affected. In the early morning of July 27, a landslide occurred in Chuncheon, Gangwon-do, killing 13 people. At Mt. Umyong in Seocho-gu, Seoul, there was also a landslide and debris flew into a condominium, killing 16 people.
Aug. 25-27 Philippines Collapse Typhoon Nanmadol directly hit a wide area of northern Luzon Island of Philippines. collapses frequently occurred between August 25 and 27, killing 28 people and injuring 37. In northern Baguio, a garbage collection facility collapsed due to a debris flow, killing 8 people. A total of 95,540 households and 403,193 people were affected in 7 provinces.
Aug. 29 Uganda Landslide At around 1:00 AM on August 29, after continuous heavy rainfall, a landslide occurred in Mabono village, Bulambuli district, east Uganda. Over 20 houses were crushed by the debris, which reportedly killed 28 people, including 6 children. About the same time in the Buluganya section of the same district, another landslide buried and killed 16 people.
Sep. 3-4 Japan Debris Flow, Landslide, Collapse As Typhoon Talas hit a wide area mainly in western Japan, and caused 208 cases of sediment-related disasters. Particularly in Nara, Wakayama, and Mie prefectures located south of Osaka and Kyoto had torrential rain exceeding 1,000 mm. Kamikitayama, Nara Prefecture, had cumulative rainfall of 1,812.5 mm (between Aug. 30 and Sep. 4) with maximum daily rainfall reaching 661 mm (on Sep. 3). This rain caused a combined total of 101 cases of sediment-related disasters (61 debris flows, 13 landslides, and 30 collapses) in 3 prefectures. The casualties were 41 people dead and 15 missing. In addition, massive landslides created landslide dams in 17 locations. The Ministry of Land, Infrastructure, Transport and Tourism together with each prefecture worked on dam destruction monitoring, caution/evacuation measures, and emergency measures.
Sep. 26 Philippines Collapse Typhoon Nesat that crossed the northern Philippines between Sep. 24 and 28 caused a lot of floods and collapses, leaving 83 people dead, 91 injured, and 20 missing across the country. Some 58,747 households and 250,000 people evacuated. A total of 7 people died and 14 were injured due to collapse in multiple locations.
Second half of Oct. El Salvador
Flood, Collapse For about 2 weeks from mid-October, a tropical depression (called 12-E) widely covering Central America brought intermittent heavy rainfall. This caused floods and collapses in many locations, leaving about 120 people dead, 117,000 people evacuated, and 760,000 people affected in 4 countries.
Nov. 5 Colombia Collapse At around 6 AM on Nov. 5, in a slum of Manizales, the largest city of Caldas, located 287 km west of the capital Bogota, Midwestern Colombia, continuous heavy rain that started on previous day triggered to collapse a grassy slope right under the houses. 16 houses clustered at the foot of the slope were burried in debris. This bourght 48 people dead and 14 missing.
Nov. 30 Indonesia Collapse In Nias Island, Majo Kampung Barije, 120 km west of Sumatra Island, a collapse occurred due to 3 days of continuous heavy rainfall, burying 37 of 115 houses in debris and killing 35 people.
Dec. 12 Colombia Collapse Collapses occurred at three sites at 5:50 PM in Moncayo village, La Cruz city, Nariño, the westernmost county of Colombia, which just entered a new rainy season. At one site, 14 people were buried in debris and died. The government had announced a risk of disaster in this region for 4 years. On the day of the incident, another disaster hit a nearby village and an evacuation annnouncement was issued by the government. Several families returned their houses and met with a calamity.
Dec. 17 Philippines Debris Flow, flood Typhoon Washi passed south of Mindanao Island from east to west, causing unprecedented damage: 1,268 dead, 181 missing, and 51,144 houses fully or partially destroyed. The damage concentrated in Cagayan de Oro City along the Cagayan de Oro River in the northwest region and Illigan City along the Mandulog River, where 1,206 people died due to debris flow and flood.