Abstract
Throughout Europe, there is a considerable need for investment in the upgrade of sewer systems - due to three main factors: ageing infrastructure, climate change and urban population growth. The need for investments is expected to grow significantly in the years ahead. Trenchless rehabilitation (no-dig) of sewer pipelines is a cost-efficient and environmental friendly method for upgrading existing pipelines with sufficient capacity. This study examines the possibility of applying no-dig to combined sewer systems (CS) with insufficient capacity. In this study, a concept assessment methodology that combines the analytical approaches from stormwater and sewer system assessments is presented. The methodology was tested on a case area that was part of an environmental project in Oslo, Norway. Three alternative concepts were examined; A0: no-dig and low impact development (LID), A1: no-dig, LID and green infrastructure (GI), and A2: CS up-sizing using open-cut methods. The study concludes that CS with insufficient capacity can be rehabilitated using no-dig if LID and GI. The combination of no-dig and LID reduces costs considerably but does involve the risk of damages from uncontrolled surface runoff. The main risk-reduction measure is the development of GI as an integrated stormwater management system that requires cross-sector collaboration within municipalities.
Highlights
An increasing need for investments in sewer network renewal Water and wastewater services are vital functions in a society
This study examines the possibility of applying no-dig to combined sewer systems (CS) with insufficient capacity
This study aims to develop a method for evaluating no-dig, low impact development (LID) and green infrastructure (GI) as an alternative for improving the quality and capacity of the CS
Summary
An increasing need for investments in sewer network renewal Water and wastewater services are vital functions in a society. To ensure that the sector provides good-quality services, the water and wastewater networks must be continuously rehabilitated and upgraded. The Norwegian capital Oslo reported the highest investment costs per household, at EUR 201 in 2019. This cost was more than twice as high as for second-ranked Hamburg in Germany (EBC 2019). The total annual cost of sewer network renewal in Norway averages EUR 250 million. Studies show that Oslo is among the municipalities in Norway with the lowest investment costs per household (The Norwegian Water Association 2019)
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