Portland east side tunnel project

Tunnels: Sustainable Solutions for Major Water and Wastewater Infrastructure

As public demands for sustainable infrastructure grows, urban leaders are taking a closer look at the economic, environmental and social benefits of underground tunnels.
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The advantages of constructing water and wastewater infrastructure underground to serve cities have often been overlooked in favor of surface construction methods.

But that trend is shifting as the environmental, social and long-term economic benefits of constructing large-diameter underground tunnels are far greater compared with traditional cheaper surface conveyance methods, particularly in urban communities.

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