Abstract
Abstract Within the framework of the International Hydrological Decade (IHD), a national groundwater network has been established by the Geological Survey of Sweden. The aim of the project is to study quantitative and qualitative groundwater variations and their relation to geology, topography and climatology. This paper specifically deals with observation area no. 11, File Hajdar on the island of Gotland, where Silurian limestone constitutes the main aquifer. Very large and rapid short-term fluctuations of the groundwater level have been recorded (25 m in less than a day). The annual amplitude is, in general, less than 30 m. The fluctuations have been compared with precipitation and evapotranspiration, and the effective fissure porosity of the limestone has been calculated. The values range from 0.06 to 0.47 per cent.
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