For a long period of time the need for power in Germany has mainly been and is still covered by coal as a very important resource. To extract the coal, some big holes in the surface were dug. After ending of the coal mining, they were filled with water in order to use them effectively, so anthropogenic lakes will be created. By 2050 the water surface area in the south of Leipzig will be enlarged to 6000 ha as a consequence of human intervention (Berkner, 2003). Due to the changed soil surface, there will be generate a change in the interaction between the atmosphere and the earth. In this article an approach is demonstrated to classify the effects of anthropogenic lakes with help of a mesoscale model.