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Wastewater Treatment Facility Levee Design
Warwick, RI

The Warwick (RI) Sewer Authority (WSA) Wastewater Treatment Facility (WWTF) was constructed in 1965 along the banks of the Pawtuxet River for advanced treatment of sewage from the city.  To alleviate flooding damage from the river, construction of an 2,300-foot long earthen levee, designed to provide protection from a 100-year flood stage was completed in 1986.

During the historic March 2010 floods, the Pawtuxet River swelled significantly higher than the 100-year flood level and overtopped the levee to inundate the Warwick Waste Water Treatment Facility.  Some areas of the facility were submerged under ten feet of water, sewage treatment for businesses and more than 60,000 residential customers was disrupted for several weeks, and damages totaled approximately $14 Million. 

Deemed a critical facility, the WSA retained Pare to design and implement a project that raised the height of the levee by 5.5 feet.

To do this, Pare developed a stability model to maximize slope and internal zoning configurations.  The design incorporated concrete retaining walls to support a zoned embankment, a toe drain and retaining walls. The project was completed ahead of schedule and under budget!