This paper analyzes the impact of durations and starts of water pumping into the water reservoir on the capacity of the pumping station and water reservoir volume. Two different regimes of water consumption by the population are considered in combination with three different regimes of pumping station operation. The pumping station works in accordance with the usual regimes of the water pumping into the reservoir. The pumping is continuous, from 0 to 24 h, 22 to 6 h ("off-peak" period), and

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... ng the usual duration of solar radiation (from 6 to 18 h). A sensitivity analysis has been conducted, in the form of observing the effect of changes in duration and start of water pumping on the pumping station capacity and reservoir volume. The purpose of this research is to determine how the resulting functional dependencies can contribute to improving the operational characteristics of the pumping station and water reservoir. Also, this research provides new insights for the scientists and practical guidelines for the water supply system managers and engineers, allowing adjustment to the changes caused by the change of pumping station and water reservoir work regimes.