El Salvador - GFDRR

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8 | El Salvador: Damage, Loss, and Needs Assesment Ida again gained strength on Saturday, November 7 th , when it entered the Caribbean, strengthening between 9:00 and 10:00 p.m. By 10:00 p.m. on Saturday, rain had increased significantly in the Departments of San Salvador, La Paz and San Vicente. Ida was reclassified as a Category 1 hurricane at 11:15 p.m. Associated with the low-pressure system, it continued to cause intense, ongoing precipitation in San Salvador between 8:00 p.m. on Saturday and 2:00 a.m. on Sunday, November 8 th . In the Departments of La Paz and San Vicente the heaviest rainfall occurred at 10:00 p.m. on Saturday and at 4:00 a.m. on Sunday, November 8, 2009. The weather station that recorded the greatest accumulated precipitation was that located at the San Vicente (Chinchontepec) volcano, totaling 355 mm (with a maximum intensity of 81 mm per hour and 317 mm in 7 hours). The spatial distribution of rainfall shows the heaviest concentration in the Departments of San Salvador, La Paz and San Vicente. On Sunday, November 8 th , the low-pressure system continued along El Salvador’s coastline, gradually weakening. IMAGE 2. RAINFALL RECORDED ON NOVEMBER 7, 2009 Source: Joint Research Center of the European Commission (JRC). The intense rain and most of the landslides were concentrated on the steeper slopes in an area of approximately 400 km 2 between Lake Ilopango and the San Vicente volcano. Consequently, the greatest impact was observed on the northern side of the volcano and on slopes to the south and southeast of Lake Ilopango. The most affected slopes face northward.
I. DESCRIPTION OF THE EVENT | 9 IMAGE 3. MUNICIPALITIES AFFECTED BY TROPICAL STORM IDA IN EL SALVADOR Source: Joint Research Center of the European Commission (JRC). 1. Description of Types of Landslides The following types of landslides were observed: a) Lahars. Flow of materials and mud composed of pyroplastic material8 and water on the slopes of a volcano, generally following the course of a river in a valley. Lahars were the principal type of landslide on the San Vicente volcano. b) Shallow landslides. In this type of landslide, the runoff surface is within the soil layer or eroded rocks, at depths ranging from decimeters to several meters. These landslides predominated on the slopes surrounding Lake Ilopango. c) Depressions. These consist of massive erosion that occurs when unstable or unconsolidated materials move a short distance over a slope. The landslide area may be a raised concave or flat. Many of these depressions occurred along road slopes. 8 Pyroplastic flow: a phenomenon that accompanies a volcano’s eruption, also called a pyroclastic cloud, pyroclastic lava or glowing cloud. It happens when lava with a high gas content cools and decompresses upon reaching the surface during a volcanic eruption. http://www.wikiteka.es
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AUSTRALIA BELGIUM BRAZIL CANADA DEN
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El Salvador - GFDRR

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