Abstract
Shortly before midnight on Wednesday, July 27, 2011, the landslide dam forming a lake on the Matthieu River, Dominica, West Indies rapidly breached. The complete draining of the lake caused major flooding along the lower Layou River Valley. No fatalities or injuries resulted despite significant property and infrastructure damage. Government estimates place the cost for immediate cleanup and long-term repairs between ECD$9 million and ECD$18 million. The lake created by the landslide dam was unusual for having persisted nearly 14 years. Formation of the Matthieu landslide dam was associated with formation and breaching of two smaller landslide dams on the Layou River in 1997. Available evidence is consistent with breaching due to landsliding on the face of the landslide dam. Landslides removed sufficient material to permit the lake to flow over the dam and erode the dam to about the level of the pre-existing channel of the Matthieu River.
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Acknowledgements
The authors would like express their appreciation to Inspector Christopher Laville of the Commonwealth of Dominica Police Service, for sharing some of his aerial and ground images taken of the Matthieu/Gould/Layou area days after the 2011 disaster.
We also wish to acknowledge Jude Charles and Kelvin Felix of St. Joseph of Layou Village and St. Joseph in Dominica, respectively, for alerting the senior author about the disaster.
Thanks too to Dominica's Forestry, Wildlife & Parks Division, the Office of Disaster Management, The Ministry of Public Works, Energy and Ports, and the Special Services Unit of the Police Service, for facilitating some of the field visits made by the senior author to the Layou-Matthieu-Carholm-Gould area following the 2011 disaster.
The authors appreciate the constructive comments provided in the review by Dan Shugar.
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James, A., De Graff, J.V. The draining of Matthieu landslide-dam lake, Dominica, West Indies. Landslides 9, 529–537 (2012). https://doi.org/10.1007/s10346-012-0333-9
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DOI: https://doi.org/10.1007/s10346-012-0333-9