Extending extreme phenomena due to climate changes, in the form of very intense rainfall, but also prolonged periods of drought combined with high temperatures expose sewage systems of many cities in Poland to new risks. The effect of these changes is not only the expanding range of flow streams from extremely low to extremely high, but also clear changes in the composition of the transported medium. Climate change also significantly affects the deterioration of the geotechnical conditions of foundation of sewage networks and accompanying buildings. The experience of recent years shows that one of the most critical elements in this area is the connection of the sewage network with the sewage treatment plant. Due to location conditions in many Polish cities, the collector connecting the network with the sewage treatment plant runs in very difficult geotechnical conditions, and in addition it is necessary to change the flow regime from gravitational to pressure. This makes connecting sections particularly vulnerable to breakdowns due to interruptions in the work of the pumping station and unsealing of the pressure hoses themselves.

The real possibility of occurrence of this type of emergency events with potentially high losses for the natural environment makes you think about creating emergency scenarios. An important element of them should be ready plans for rapid emergency hydraulic bypass installations. To this end, one should think about providing adequate field reserves in the vicinity of critical infrastructure, having adequate material reserves and emergency readiness of assembly brigades. Perhaps this type of emergency systems should be created jointly by sewage system operators on a regional or even national scale due to their costs. The exchange of technical and organizational knowledge in the area of efficient implementation of emergency hydraulic bypasses is also very important. The main purpose of the paper is to present Uponor’s experience in this area. The presentation will discuss the experience gained at individual stages of the project implementation of laying an emergency pipeline on a pontoon bridge, transporting sewage from one of the country’s largest combined sewage systems to a sewage treatment plant located on the other side of a large river. The installation of the temporary pipeline was unusual due to the method of foundation and very short implementation time. Issues related to planning, effectiveness of implementation and proper coordination of works will be presented, including non-standard activities due to time pressure.

The presentation will be made by Paweł Pill, a graduate of Environmental Engineering at Warsaw University of Technology. Over 20 years of experience in the design, simulation and optimization of fluid networks. For 19 years as a Project Manager at KWH Pipe and Uponor Infra, he is responsible for technical sales support, with particular emphasis on industrial installations.

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