Jurassic Coast - Lyme Regis

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Lyme Regis case study: Immediate action

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Engineer's Approach

Lyme Regis Homepage

Preliminary Studies

Summary of Problems

Outline Solutions The extensive ground investigations have provided essential information on geology and landslide mechanisms for the design of coast protection and slope stabilisation works. Part of the investigations comprised the installation of instruments to monitor ground movements and groundwater levels, in order to obtain a detailed understanding of landslide mechanisms.
These instruments are also used for detecting unusually rapid or accelerating ground movements, which could be the precursors of destructive landslide activity.

A three-tier landslip warning system, similar to that employed by the Environment Agency in relation to flooding, is employed:

Level 1: Landslip Watch - detailed observation of areas where monitoring has indicated a landslip is imminently possible.

Level 2: Landslip Warning - informing occupants in areas where landslips are expected to occur and may affect their properties.

Level 3: Severe Landslip Warning - informing occupants where landslips will occur and will affect their properties.

With the equipment in place, it is now possible to monitor movement across the vulnerable slopes of the town. The unusually heavy rain of 2000/01 has led to the issuing of several landslide warnings based on rapidly accelerating landslide movement. Residents in the areas affected are informed of the situation through a leaflet drop and the local media. An emergency plan has been drawn up in the event of a major landslide.

Below you can download the files showing rainfall and landslide movement between June 2000 and January 2001

Lyme Inclinometer data.pdf (8k - In Adobe Acrobat format)
Lyme Inclinometer data.xls (28k - In Microsoft Excel format)

Lyme daily and rainfall data.pdf (12k - In Adobe Acrobat format)
Lyme daily and rainfall data.xls (44k - In Microsoft Excel format)

Heavy rainfall in the autumn of 2000 dramatically affected the rate of deformation of the boreholes, leading to the issue of 2 Level 1 and 1 level 2 Landslide Warning Notices late in the year. When the movements stopped the warnings were stepped down

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		Lyme Regis case study: Immediate action
Other pages Engineer's Approach Lyme Regis Homepage Preliminary Studies Summary of Problems Outline Solutions		The extensive ground investigations have provided essential information on geology and landslide mechanisms for the design of coast protection and slope stabilisation works. Part of the investigations comprised the installation of instruments to monitor ground movements and groundwater levels, in order to obtain a detailed understanding of landslide mechanisms. These instruments are also used for detecting unusually rapid or accelerating ground movements, which could be the precursors of destructive landslide activity. A three-tier landslip warning system, similar to that employed by the Environment Agency in relation to flooding, is employed: Level 1: Landslip Watch - detailed observation of areas where monitoring has indicated a landslip is imminently possible. Level 2: Landslip Warning - informing occupants in areas where landslips are expected to occur and may affect their properties. Level 3: Severe Landslip Warning - informing occupants where landslips will occur and will affect their properties. With the equipment in place, it is now possible to monitor movement across the vulnerable slopes of the town. The unusually heavy rain of 2000/01 has led to the issuing of several landslide warnings based on rapidly accelerating landslide movement. Residents in the areas affected are informed of the situation through a leaflet drop and the local media. An emergency plan has been drawn up in the event of a major landslide. Below you can download the files showing rainfall and landslide movement between June 2000 and January 2001 Lyme Inclinometer data.pdf (8k - In Adobe Acrobat format) Lyme Inclinometer data.xls (28k - In Microsoft Excel format) Lyme daily and rainfall data.pdf (12k - In Adobe Acrobat format) Lyme daily and rainfall data.xls (44k - In Microsoft Excel format)
Heavy rainfall in the autumn of 2000 dramatically affected the rate of deformation of the boreholes, leading to the issue of 2 Level 1 and 1 level 2 Landslide Warning Notices late in the year. When the movements stopped the warnings were stepped down

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