Abstract: Supplying the population with drinking water is an indispensable segment within today's high-quality and sustainable development of human society. The sustainability of water supply systems can be improved by exploiting available renewable energy sources. External renewable energy sources are mostly solar energy, wind energy, water energy, geothermal energy and energy obtained from biomass, hydrogen energy. In contrast, internal renewable energy exists in the water supply system itself. The paper analyzes the possibility of using internal energy by installing a turbine on the main gravity supply pipeline from the Tribistovo reservoir to the water treatment device of the Posušje municipality water supply system.

Keywords: water supply, sustainability, renewable energy sources, turbines on water supply pipelines

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