Jensen Deflective Separator Pretreats Stormwater Runoff

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Los Cerritos Channel Stormwater Capture Facility
Long Beach, California

The 17,771-acre Los Cerritos Channel Freshwater Watershed in Southern California showed exceedances of the total maximum daily load limits established by the US Environmental Protection Agency for total suspended solids and several heavy metals. Seven cities in the watershed were accountable for resolving a mandate to lower the levels, including Bellflower, Cerritos, Downey, Lakewood, Long Beach, Paramount, and Signal Hill. The solution was a single, large diversion, treatment, and infiltration infrastructure.

Jensen Precast engineers designed, manufactured, and delivered a Jensen Deflective Separator system for the $20 million multi-city effort to capture and treat stormwater runoff in Los Angeles County. “We built a system that takes in 166 cubic feet of stormwater per second through a precast concrete flow splitting structure into dual hydrodynamic separator units deployed inside two 16-foot diameter precast concrete structures,” says Walter Stein, Jensen Precast Stormwater Systems Manager. “The system efficiently pretreats diverted stormwater from the Los Cerritos Channel into a detention and infiltration gallery.”

Instead of each municipality addressing stormwater treatment individually, one large regional system was built to collectively remove the pollutants and curb costs. The Los Cerritos Channel Sub-Basin 4 Stormwater Capture Facility eliminates most polluted dry weather runoff while diverting, treating, and infiltrating first flush stormwater flows impacting the watershed.

Product: Dual Jensen Deflective Separator units inside two precast concrete structures 16’ diameter. Precast concrete flow splitting structure. Made in United States.

Project Galley