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Smith Road Mini Storage

Ferndale, Washington

Stormwater Management


Weden Engineering


October 2020

Technical Description:

  • (2) Filterra Peak Diversion Bioretention Systems
  • ChamberMaxx Stormwater Chamber System

A new mini storage facility in Ferndale, Washington, needed a stormwater management system that included both quantity and quality controls.

The local and state regulations required runoff to be treated for sediment and heavy metals (zinc & copper). Additionally, regulations required runoff reduction measures to be implemented.

The site was complex due to the city's storm sewer system's flat and shallow flow lines and high groundwater concerns. Engineers at Weden Engineering looked to Contech to help them with the design.

To meet the treatment requirements, engineers specified two Peak Diversion Filterra bioretention systems. Using Filterra allowed the engineer to adjust the inlet pipe elevations to work within the site constraints. Other gravity flow treatment systems would have required the site to be raised using imported fill.

The engineer specified the low-profile ChamberMaxx chamber system for quantity control, allowing the engineer to design the retention systems within the site profile.

Contech engineers provided full design and sizing support for the ChamberMaxx and Filterra systems.      

"This project was very challenging, a small site with no elevation drop, no infiltration, and almost entirely impervious," said Marjorie Bills, engineer at Weden Engineering. "ChamberMaxx and Filterra products saved the day but equally or more valuable was the assistance from the professionals at Contech. Throughout the entire design, review, and construction process, Contech readily offered technical and moral support. Their help was absolutely invaluable."

The winter of 2021 in Whatcom County saw massive flooding with storm events beyond 100-yr thresholds. The owner reported that the site remained dry! A testament to good design and highly performing stormwater products.

Technical Description:

  • (2) Filterra Peak Diversion Bioretention Systems
  • ChamberMaxx Stormwater Chamber System

800-338-1122 |
Project #: 631518

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