The purpose of the study is to assess the environmental acceptability of the technogenic component object of activity in the form of a complex of hydraulic structures as part of existing natural engineering systems in nature-technical systems on the use of water resources in economic and other activities, quantitative and qualitative indicators of which are formed within the spatial limits of river basin geosystems on the example of the Don, Kuban, Terek rivers. The interrelation of the concepts of Energy and Entropy in the use of water resources in the branches of economic and other activities causes the imperfection of structural elements in the composition of the object of activity, which affect the growth rate of Entropy. The developed energy-entropy approach in assessing the level of environmental acceptability of structural elements in the composition of the object of activity in a thermodynamic sense helps to reduce the growth rate of the Entropy level in the zone of influence of the Object of activity.