Event Date : 08-01-2018
Location : Kerala, India
Report Date : 10-17-2018
Event Category: Flood,Landslide
Sequence of Events: Yes
Report Number: GEER-058
DOI: doi:10.18118/G6ZH3K
Event Latitude: 10.8505
Event Longitude: 76.2711
Team:
Thomas    Oommen
Richard    Coffman
Collaborators: University of Kerala
Contributors: K.S. Sajinkumar, C.L Vishnu
Sponsors:
  • NSF-GEER,
Summary:

The Southern State of Kerala in India experienced extreme rain in August from the 1st to the 20th, 2018. The state received a cumulative rainfall of 771 mm during that period, which is 140% more than the normal for that time period. The extreme rain event led to flooding and landslide hazards leading to 483 deaths and severe destruction of property. The NSF sponsored GEER team members (Dr. Thomas Oommen, Michigan Tech; Dr. Richard Coffman, University of Arkansas) in coordination with colleagues from University of Kerala (Dr. Sajinkumar K.S. & C.L. Vishnu) conducted a reconnaissance study to gather perishable data. The study was carried out from September 4th to 9th, 2018. The team traveled to three districts that have been affected by the disaster (Alleppey, Idukki, & Ernakulam). The details of the trip and the data collected are summarized in the report. The preliminary finding indicates that the failure of bund in Alleppey further aggravated the flooding and led to the slow recession of flood waters. The flooding in Alleppey has also led to the differential settlement of several buildings. In the district of Idukki, several landslides were identified near recent construction. The alteration in the topography for construction has led to more infiltration and increased groundwater levels during the rain event that have led to these landslides. In addition, soil piping and subsurface drainage channels were also frequently identified at landslide sites in Idukki.

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The work of the GEER Association, in general, is based upon work supported in part by the National Science Foundation through the Geotechnical Engineering Program under Grant No. CMMI-1266418. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. The GEER Association is made possible by the vision and support of the NSF Geotechnical Engineering Program Directors: Dr. Richard Fragaszy and the late Dr. Cliff Astill. GEER members also donate their time, talent, and resources to collect time-sensitive field observations of the effects of extreme events.
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