The authors analyse the water reservoir Domaniów influences on the environment both negative and positive. To the first group belong number geomorphological changes of terrain by build the dam on the Radomka river which the length = 740 m and height about 16 m and also embankments. Change the land utilization structure, infrastructure, and road and technical and deforestation displacement the people. However positive influences of reservoir water Domaniów are following the improvement humidity the air and soil in zone of water reservoir impact the building new road infrastructure, supply the water and canalization all villages which there are round the water reservoir Domaniów , the building new farms, houses with guest rooms, lawns at the houses, playgrounds to the football and net, beaches, gastronomic points and so on. The water reservoir generates good conditio for bath and water sports, supplies also electricity and the water to the fish ponds and irrigation, increases also biomass production, biodiversity the forests and grasslands round water reservoir Domaniów. The balance analysis of all mentioned influences indicates undoubtedly, that water reservoir Domaniów is proecological investment because influences on the environment is more positive than negative.

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