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Broad Beach Road Biofiltration Project
Project Description
The Broad Beach Road Biofiltration Project aims to prevent dry weather flows, and treat feasible volumes of wet-weather flows that might otherwise discharge to the Area of Special Biological Significance (ASBS). The project diverts dry-weather and stormwater runoff from nine storm drain inlets along a one-mile stretch of Broad Beach Rd into a combined porous parking and engineered biofiltration system on the north shoulder. Runoff is treated through evapotranspiration and biofiltration.

The preliminary project design report determined that biofiltration would be the most effective means of meeting the project goals, so a system of bioswales, lined to prevent infiltration into the subsoil was installed to filter the stormwater.

The project was accepted as complete by the City Council in August 2015.

Project Benefits
Project benefits may include habitat restoration of some of the slopes above Broad Beach Rd adjacent to Pacific Coast Highway. Drip irrigation will be utilized to establish the planted vegetation and to maintain their appearance during summer months and extended dry weather. If feasible, water supply for drip irrigation will be drawn from shallow groundwater wells along the biofiltration system, effectively recycling the filtrated rainwater, enhancing evapotranspiration of the system while, at the same time, conserving water and minimizing groundwater mounding.

Funding
The project is funded primarily by a $2.25 million grant from the State Water Resources Control Board with contributions from the City.

Resources

Contact Us

Elizabeth Shavelson
Assistant to the City Manager

Eshavelson@malibucity.org
310-456-2489 ext. 254

23825 Stuart Ranch Road
Malibu, CA 90265

City of Malibu