Stockholm needs a climate hazard strategy

Stockholm city is located on the border between the large lake Mälaren and the Baltic Sea, thus the city is highly sensitive to future changes in river runoff as well as lake and sea levels. The underground subway along with the different existing and planned road traffic tunnels are also highly vulnerable to extreme precipitation events. Expected climate change effects include greater rainfall intensities, with a 25% rise in extreme rain events by the end of the century. As a result, the Stockholm area will experience a rise in both flash floods and “pluvial flooding” that may last for weeks and cover large areas.


Elderly people and certain susceptible groups are threatened the most by contamination of drinking and bathing water. Therefore morbidity (visits to health care centres, hospital stays, days away from work, etc.) and discomfort among the inhabitants rise. Especially in densely populated areas with low level of green spaces and high traffic intensity. Such a requirement calls for an optimization of use and tailoring of existing climate data and services.


CLARITY's approach is to intervene in each stage of the climate-proofing analysis by facilitating the assessment of vulnerability and risks. At the same time we will evaluate adaptation options for urban planning projects. CLARITY builds its strategy on impact indicators calculated from existing climate services like SMHI (Swedish Meteorological and Hydrological Institute). Moreover, through our network of projects in different parts of Europe (e.g. Italy, Austria or Spain) we will get feedback from users, covering additional application areas, such as industrial planning, risk management and drought management.


In this project, SMHI is responsible for the climate and air quality information delivered through CLARITY and to be used in Stockholm and also in the County of Jönköping in southern Sweden. SMHI will act closely with consultants from WSP (William Sale Partnership), experts in urban flooding as purveyors, facilitating an efficient use of the enhanced climate services for planners. The CLARITY climate service will both serve planners with decision-support as well as give operational staff at stake-holder organizations a possibility to train and develop routines that permit a better preparedness for droughts, extreme precipitation, flooding, heat, air and water pollution events.