Abstract
The aim of the study was to locate and describe groundwater outflows in a selected lake basin. The second aim was to measure spring discharge and measure physical characteristics of the studied waters ( temperature, conductivity ). The time scope of the work comprised the period from January 2011 to September 2012. The spatial scope of the work included the area of Lake Radunskie Gorne located in the Kashubian Lake District in northern Poland. The study consisted mostly of fieldwork and reviewing archived materials. Four groundwater outflows were located in the course of the study. Their total discharge was 4.6 l·s-1 and ranged between 0.5 and 2.5 l·s-1. This produces an annual yield of about 145,000 m3·yr-1. This value is comparable to that for other lakes in the world. In effect, Lake Radunskie Gorne receives about 0.15% of its water from under-lake springs. This is a minute value in comparison with the lake’s total groundwater recharge ( 97 mln m3 per year ). However, it must be assumed that the actual number of under-lake springs is many times greater than that identified in the course of this study, which means that the share of water supplied in this manner is likely much higher and its effect on water chemistry and water levels in the lake is also likely much more pronounced.
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