Welcome to the official website of the Dorset Geologists’ Association Group (DGAG).

Upcoming events of general geological interest in Dorset, and the surrounding region, are listed below.

For a more specific listing, use the search bar, below, or select one of the following categories:
Dorset Geologists’ Association Group (DGAG), Devon, Dorset, Hampshire, Somerset, Wiltshire.

For geoconservation workparties, see the DIGS website.

Loading Events

« All Events

  • This event has passed.

Control the drainage: The gospel accorded to sinkholes

January 4 @ 6:00 pm - 7:30 pm

Talk by Dr Tony Waltham.

Join us for an interesting and informative evening!

Non-members are welcome free of charge.

Karst is a landscape that is distinguished by underground drainage and is normally formed on limestone or gypsum. Its impact on engineering geology is the distinctive suite of karst geohazards, which are largely related to the holes in the ground of varying size and unpredictable nature.

The most widespread and frequent geohazard is the development of new sinkholes within the soil profile over a cavernous limestone; they develop by suffosion, where soil is washed down into cavities in the stable rock.

New suffosion sinkholes are nearly all formed by rainstorms, new drainage inputs or water table decline; they are therefore largely avoidable if the gospel of drainage control is obeyed.

Join us for an interesting and informative evening!

Tea at 5.30 pm with the lecture starting at 6.00 pm.

Non-members are very welcome to attend for an introductory visit – please telephone 020 7434 9298 or email the Executive Secretary (sarah@geologistsassociation.org.uk) for further information.

Live video stream



January 4
6:00 pm - 7:30 pm
Event Category:


Janet Watson Lecture Theatre
The Geological Society, Burlington House, Piccadilly
London, W1V 0JU United Kingdom
+ Google Map


Geologists’ Association
020 7434 9298