Winding Underwater

High-density polyethylene pipe provides the answer to the challenge of replacing and upsizing a sewer interceptor beneath an Oregon lake

The 24,000-foot-long concrete and cast-iron Lake Oswego (Ore.) interceptor sewer (LOIS) had insufficient capacity to handle development and peak wet-weather flows, resulting in surcharged manholes.


Part of the gravity-flow system traverses Oswego Lake. The 9,700-foot-long...

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