№3|2025

WASTEWATER SYSTEMS

UDC 628.221
DOI 10.35776/VST.2025.03.05

Volkov Sergei, Luk’ianchuk Maksim, Zhukova Anastasiia, Solokhin Anton, Kuz’min Valentin, Zhitenev A. I., Rublevskaya O. N., Gvozdev V. A., Erofeev Vasilii, Kostenko I. G., IGNATCHIK V. S., Ignatchik S. Iu., Kuznetsova N. V., Seniukovich Mikhail, Eshchenko Andrei

Justification of the optimum alternative of the wastewater disposal system of St. Petersburg adapting to the conditions of the joint effect of urbanization and climate change.
Part 1. Program-method for justification of the optimal alternative

Summary

The wastewater disposal system of Saint-Petersburg has been operating under the conditions that differ from the design ones owing to main reasons. The first reason is the process of urbanization that involves water flow rate decreasing in dry weather because of the water consumption reduction, and water flow rate increasing during rainy periods due to the increasing share of watertight coverages. The second reason is the increasing intensity and frequency of rain showers. In this regard, adapting the wastewater disposal system to the conditions that arise under the joint effect of urbanization and climate change became a necessity. The consequence of the new operating conditions is the presence of two undesirable phenomena: flooding of territories and overflows of storm drains, emergency outfalls, emergency outlets and bypass lines of the treatment facilities. Justification of the optimal solution for adapting the Saint-Petersburg wastewater disposal system to the conditions of the joint effect of urbanization and climate change should provide for the solution of a double criterion optimization problem: search for an economically feasible option for the system reconstruction to eliminate floodings in the city during rainfall with a frequency of Р > Рopt; search for an economically feasible option to ensure minimal discharges through overflows during rainfall with a frequency of Р > Рopt during the operation after the reconstruction. From a mathematical point of view, the search for an economically justified reconstruction option comes down to determining such a period of rain frequency Popt, where one of two equivalent conditions is met: either the minimum cost of damage from flooding and the cost of preventing it is achieved; or the maximum difference between the amount of prevented damage from flooding and the costs of preventing it is achieved.

Key words

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For citation: Volkov S. N., Luk’ianchuk M. Iu., Zhukova A. G., Solokhin A. A., Kuz’min V. A., Zhitenev A. I., Rublevskaia O. N., Gvozdev V. A., Erofeev V. V., Kostenko I. G., Ignatchik V. S., Ignatchik S. Iu., Kuznetsova N. V., Seniukovich M. A., Eshchenko A. N. Justification of the optimum alternative of the wastewater disposal system of St. Petersburg adapting to the conditions of the joint effect of urbanization and climate change. Part 1. Program-method for justification of the optimal alternative. Vodosnabzhenie i Sanitarnaia Tekhnika, 2025, no. 3, pp. 42–50. DOI: 10.35776/VST.2025.03.05. (In Russian).

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