392722 - Optimization of Green Stormwater Infrastructure Projects in the City of Los Angeles
Wednesday, June 6
4:00 PM - 5:30 PM
Location: Mirage Room
Wing Tam, 1149 S. Broadway, 10th Floor Los Angeles, CA 90015 – LA Sanitation; Shahram Kharaghani, 1149 South Broadway, 10th floor Los Angeles, CA 90015 – LA Sanitation; Hugo Loáiciga, University of California at Santa Barbara (UCSB) Santa Barbara, California 93106 – UCSB
Stormwater poses flooding and pollution in metropolitan areas, and impacts of unclean urban stormwater have given rise to Green Stormwater Infrastructure (GSI). The City of Los Angeles’ (City) Los Angeles Sanitation (LASAN) has spent over $600 M for the past 10 years applying GSI for stormwater treatment/capture/infiltration/reuse. These GSI project types comprise Natural Treatment Systems, Mechanical Systems, and Passive BMP Systems in public sites (e.g., right-of-ways, alleys, lakes, parks, parking lots). After many years of operation for these GSI projects the optimization of these City projects was initiated to ensure that project elements are working in an optimal manner to assist in meeting water quality requirements and maintaining long-term project sustainability. The optimization GSI presentation will cover all the aspects of using GSI and the lessons learned from the design, construction, and post-construction phases, from operations & maintenance (O&M), and from water quality & quantity characteristics achieved. Uses of GSI are to capture, slow, infiltrate, and retain stormwater on site, employing systems that include catch basin intercepts, dry well chambers, replacing asphalt with permeable surfaces, percolating stormwater through infiltration structures, providing underground storage for reuse, treating stormwater runoff before it enters water bodies. GSI projects’ performances during storm events rendering water quality and water-supply benefits and achieving Total Maximum Daily Loads (TMDLs) that must be met by LASAN will be described. Optimization of GSI have other benefits for the community, including fewer beach closures, cleaner communities, healthier environments, lowered health risks, enhanced recreational opportunities, and lower demand for potable water.