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Last Updated: Thursday, January 5, 2012 1:08 PM

Types of BMPS

Bio Filtration Swales and Strips

Biofiltration swales and strips are vegetated areas that remove pollutants from stormwater runoff as it flows through the vegetation. Removal mechanisms include filtration and infiltration. In this study, one biofiltration strip and six swales treat highway runoff, while two strips treat runoff from maintenance yards (for pretreatment for infiltration trenches). Runoff is captured in drain inlets and routed to the swales, while strips receive sheet flow directly from the pavement. Swales are conveyance channels where stormwater flow passes through the grass. Strips are broad surfaces with a grass cover that allows stormwater to flow in relatively thin sheets.

BIO STRIP

Site Location: Carlsbad Maintenance Station (west)

Directions: I-5 to eastbound Palomar Airport Road, right on Paseo Del Norte, left into station

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BIO STRIP

Site Location: Altadena Maintenance Station

Directions: I-210 to 212 North Windsor Avenue, east side of I-210

BIO STRIP

Site Location: I-605/SR 91

Directions: On I-605 northbound shoulder, access around Cerritos Maintenance Station (westbound on SR 91 to 16849 Studebaker Road)

Biofiltration swales and strips are providing useful information about vegetation that can filter stormwater pollutants effectively in dry areas with little rainfall. These biofiltration devices can also be used for pretreating stormwater going to infiltration BMPs (i.e., trenches and basins). This "treatment train" approach can increase the overall effectiveness of stormwater treatment.


 
BIO SWALE

Site Location: I-605/SR 91

Directions: On I-605 northbound shoulder, access around Cerritos Maintenance Station (westbound on SR 91 to 16849 Studebaker Road)

BIO SWALE

Site Location: Cerritos Maintenance Station

Directions: I-605 south to eastbound Alondra Blvd. exit, southbound to 16849 Studebaker Road

BIO SWALE

Site Location: I-5/I-605

Directions: I-5 southbound, south of the I-5 southbound and I-605 northbound connector, North of I-605

BIO SWALE

Site Location: I-605 Del Amo Avenue

Directions: I-605 northbound, on shoulder between Del Amo and Carson Streets

 
BIO SWALE

Site Location: SR 78/Melrose Drive

Directions: Eastbound on SR 78, 120 yards before Melrose Avenue off ramp

 
BIO SWALE

Site Location: I-5/Palomar Airport Road

Directions: Southbound on I-5, on shoulder north of Palomar Airport Road off ramp


FOR MORE INFORMATION CONTACT

Division of Environmental Analysis, Stormwater Unit
California Department of Transportation
P.O. Box 942874, MS-27
Sacramento, CA 94274-0001
Email: Division of Environmental Analysis, Stormwater Unit