TISOLS postponed!

We are very sorry to inform you that the Tenth International Symposium on Land Subsidence ( TISOLS) in the Netherlands has been postponed to 2022 due to the general concerns surrounding the COVID-19 virus and the travel restriction for many participants. As your comfort and safety is our top priority, it has been decided that this is the best course of action to give as many people as possible the chance to attend the congress without exposing them to health risks.

  • We  canceled all registrations and reimburse any paid registration fee.
  • The Proceedings of the International Association of Hydrological Sciences special issue dedicated to TISOLS are published and freely accessible! You can find them on the Copernicus website: https://www.proc-iahs.net/382/index.html. We hope you enjoy reading them!
  • Please check this website  for further updates on the new dates for TISOLS.

We will try to make the best out of this unfortunate situation and are giving our best to make the transition as easy as possible. We appreciate your cooperation and understanding immensely!

We hope to welcome you in the Netherlands in 2022.

Stay healthy and see you at TISOLS!

On behalf of the UNESCO Land Subsidence International Initiative, the TISOLS organizing committee and the TISOLS scientific committee


Gilles Erkens and Peter A. Fokker

Living with Subsidence 
From 20 – 24 April 2020, the Tenth International Symposium on Land Subsidence (TISOLS) will take place in Delft - Gouda, the Netherlands.

Land subsidence, or land-level lowering, is a major problem that threatens the viability and sustainable economic development for millions of people throughout the world, especially in (but not restricted to) highly urbanized coastal areas. It is often a result of overexploitation of groundwater resources. The total costs globally amount up to many billions of dollars annually.

New innovative technologies and approaches are needed to reduce or, in the best case, to stop land subsidence. TISOLS intends to bring together 250 international experts to share the latest research and insights on natural and anthropogenic land-level lowering.
At TISOLS in the Netherlands, we provide a platform to share our understanding of land subsidence, reliable data, and innovative techniques. Ultimately, we aim to increase the acknowledgement of the land subsidence problem in order to devise targeted strategies and solutions for long-term sustainable living conditions in subsiding areas. This means that at TISOLS we take on the challenge that lies in linking hydrological, geotechnical and geological knowledge to policy and socially acceptable solutions.

TISOLS is organized under the auspices of the Unesco IHP Land Subsidence International Initiative. This working group has endeavored to improve and disseminate knowledge on land subsidence since the 1970s, through International Symposia on Land Subsidence, collaborative projects and publications.