Esplanadi Water Supply Tunnel Project, Helsinki

We will implement a water supply tunnel for the Helsinki Region Environmental Services Authority in the centre of Helsinki. The tunnel is located under the Esplanade Park between Kaartinkaupunki and Kamppi and connects to the Munkkisaari-Mäntymäki water supply tunnel. 

The new water supply tunnel will eliminate existing problems related to the condition of sewerage and improve the management of wastewater overflows caused by heavy rainfall, thereby reducing the load on the Baltic Sea. In addition, it creates the possibility to differentiate the current poor condition of mixed sewers, which currently cause repeated need for maintenance, odor problems and raise the risk of damage.

Figure: The impact area of the excavation vibration of the Esplanade water supply tunnel and the progress of the excavation work. In the vicinity of the working area of the construction site and in the area presented in yellow.

Figure: Illustrative illustration of tunnel excavation work phases, such as measurements, drilling, blasting, transportation of the quarry, reinforcement work and finishing phases.

The work is mainly done underground in order to keep the impacts on traffic and the environment to a minimum. All construction site traffic is controlled through the Central Service Tunnel, and no significant exceptions to traffic are expected. Before the excavation, we carry out property inspections and during the contract, we carry out environmental monitoring, such as vibration measurements, groundwater quality monitoring and indentation measurements. 

The value of the contract is 18 million euros. Construction work will begin in the autumn of 2025. The excavation work will be carried out at the end of 2025 and the project is planned to end in 2027. 

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