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Sunnyland Elementary School

Bellingham, Washington

Stormwater Management


Bellingham School District


Freeland & Associates


Dawson Construction


February 2022

Technical Description:

• Modular Wetlands® Linear
• Catch Basin StormFilter
• 655' of 72" Aluminized Steel Type 2

The original Sunnyland Elementary school was built in 1926. Additions were added in 1954 and 1976, but code requirements, wear and tear, energy efficiency, and instructional program capacity all took their toll on the aging structure.

A redevelopment of the 2.92-acre site began in 2021. The project replaced the existing school and included parking and site circulation improvements. The redeveloped school accommodates up to 450 students in a new building area of 58,000 square feet. This project also includes a new 3,500 square foot covered play structure.

Washington state and local regulations required stormwater quantity and quality measures to be incorporated into the redeveloped site to reduce downstream flooding and remove pollutants. The site was split into several drainage areas, with the primary drainage area serving the school and parking lot.

The Engineer of Record considered several solutions but ultimately specified a Modular Wetlands Linear bioretention system for treatment and a corrugated metal pipe (CMP) detention system for storage. The Modular Wetlands system’s small footprint and superior pollutant removal made it the ideal treatment solution for this site.

The CMP detention system is made from 655 LF of 72” diameter aluminized steel type 2 providing 18,096 cf of storage. The strength and design flexibility of the CMP detention system provided the most cost-effective solution. Specific factors include the speed of installation, installed cost, and ability to meet strict firetruck outrigger load requirements.

A Catch Basin StormFilter was specified to provide treatment at one of the other small drainage areas.

The use of three different products on this site showcases Contech’s ability to provide a wide range of innovative, flexible product solutions engineered to solve each site’s unique challenges

Technical Description:

• Modular Wetlands® Linear
• Catch Basin StormFilter
• 655' of 72" Aluminized Steel Type 2

800-338-1122 |
Project #: 667469


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