2nd Munich S-Bahn Trunk Line – Ostbahnhof Groundwater Management
Hölscher Wasserbau is playing a key role in one of Bavaria’s most significant infrastructure developments the 2nd Munich S-Bahn trunk line by delivering comprehensive groundwater management services for the Ostbahnhof section (contract unit VE733).
This major, long-term project, running from 2025 to 2033, involves the construction of a new underground station at Ostbahnhof, including a direct connection to the Werksviertel district and the future Munich Concert Hall. The station will be built approximately 16 metres below ground, with a 210-metre platform and extensive tunnelling works, including three tunnel tubes, rescue shafts, and cross passages.
Groundwater Engineering Scope
Hölscher’s scope of work includes the design, installation, and operation of a complex groundwater control system tailored to challenging urban conditions. Key elements include:
- Installation of approximately 70 extraction wells and 20 monitoring points
- Operation of up to four groundwater treatment plants with capacities of up to 50 l/s
- Temporary pumping and infiltration systems, including trench and well infiltration
- Discharge management, including controlled release to the Isar River
- Installation of a real-time monitoring and data management system
- Development of operational and emergency response strategies
- Maintenance and regeneration of wells and infiltration systems throughout the project
- Installation of approximately 3,000 metres of pipeline infrastructure
Engineering Challenges
The project presents significant technical and logistical challenges, being located in a dense urban environment with ongoing rail operations. Groundwater control must be maintained continuously while ensuring minimal disruption to surrounding infrastructure.
Additionally, tunnelling works under compressed air conditions demand a high level of safety and precision, requiring specialised access procedures and strict operational controls.
A Landmark Infrastructure Project
Awarded after an extensive multi-stage tender and negotiation process, this contract reflects Hölscher’s proven expertise in large-scale groundwater management. The project builds on their existing involvement in other sections of the Munich S-Bahn development, further strengthening their role in this flagship infrastructure scheme.
This project highlights the critical importance of advanced groundwater engineering in enabling safe, efficient, and sustainable underground construction in complex urban environments.
