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Abstract. The paper focuses on technical analysis of spatial attice structures used in roofing of mechanical equipment rooms of hydroelectric power stations in Russia. The analysis reveals that spatial structures of "Markhi" type are used most frequently there and shows their advantages and disadvantages. The authors put forward their own solution for combining advantages of spatial spatial lattice roofing structures with those of truss frames with gusset plate units. The solution is aimed at enhancing the safety and reliability of hydraulic engineering constructions with no changes in accuracy requirements to their manufacturing. The authors also introduce their model of a spatial lattice roofing unit and give an account of its reliability and strength based on software system calculations.

The paper presents the analysis of different types of impact the hydroelectric power plants’ reservoirs could make on the environment. Hydroelectric power plants (HPP) produce ecologically safe energy and correspond to the modern striving for sustainability because they are operated on renewable energy sources. At the same time they can provoke various potential dangers for the environment. The objective of the investigation is to demonstrate the interrelation between the type and structure of a hydroelectric power plant and the way its reservoir may impact on the nature surrounding the plant. These effects may be direct and indirect, positive and negative and vary from insignificant that can be easily fixed to those that are irreversible and catastrophic. The latter should be taken into account during the design of HPP.