October 16, 2017

Geosyntec Participation at the 13th Annual CASQA Conference

Geosyntec staff made a significant technical contribution to the 13th Annual California Stormwater Quality Association (CASQA) Conference entitled "CASQA in the Capital: Building Bridges for Water" at the Sacramento Convention Center on September 25-27, 2017.

Key contributions of Geosyntec staff:

  • Lisa Austin served as the Conference Co-Chair
  • Aaron Poresky led the "BMP Science and Planning" track
  • 17 Geosyntec papers were presented by staff representing six Geosyntec offices
  • Geosyntec's Sacramento office hosted a client-event that attracted over 100 clients and colleagues
  • Geosyntec projects received their 8th State-level Award for the City of Los Angeles/Broadway project led by Mark Hanna

The conference featured training workshops, technical sessions, poster presentations on wide-ranging stormwater and water management topics with a focus around the conference theme. CASQA is a professional member association dedicated to the advancement of stormwater quality management through collaboration, education, implementation guidance, regulatory review, and scientific assessment. Its membership is comprised of stormwater quality management organizations and individuals, including cities, counties, special districts, industries, and consulting firms throughout the state.

Award

Outstanding Ultra-Urban Sustainable Stormwater BMP Project Broadway: Neighborhood Stormwater Greenway Project L.A. Sanitation - City of Los Angeles

Project Abstract

Like much of the City of Los Angeles, the Broadway neighborhood of South Los Angeles is densely developed, with little-to-no space available for the implementation of multi-benefit stormwater control measures (SCMs). This area includes dense clusters of commercial, industrial, and residential developments. Runoff from the neighborhood discharges to the Los Angeles River, listed as an impaired waterbody for pH, metals, coliform bacteria, trash, pesticides, nutrients, and oil and grease. Local water supply initiatives encourage development of supplies derived from stormwater, among other sources; and, as with many highly-urbanized areas, flooding of stormwater facilities poses risks during significant storm events.

Within this neighborhood, the City of Los Angeles Bureau of Sanitation (LASAN) recently completed the Broadway Neighborhood Stormwater Greenway Project (Project), a regional stormwater and dry-weather runoff capture project developed to help improve downstream water quality, reduce neighborhood flood risk, and increase groundwater supplies through the deployment of Low Impact Development (LID) and SCMs. The Project was identified as an ideal local project for implementation of neighborhood-wide LID designs through the Water Replenishment District (WRD) of Southern California's Central and West Coast Basins Distributed and Regional Stormwater Capture Feasibility Study.

The Project includes four levels of stormwater capture and infiltration SCMs: (1) residential rain gardens for treatment of up to eight acres; (2) neighborhood-scale LID in the form of street-end infiltration catch basins for treatment of up to 12 acres; (3) commercial LID measures for treatment of runoff from three acres; and (4) a sub-regional-scale, 417,000-gallon infiltration gallery for treatment of runoff from 30 acres of mixed land uses during wet weather design storm events and up to 220 acres during dry-weather and smaller storm events. Collectively, the SCMs/LID measures have been constructed to systematically capture, treat and infiltrate stormwater runoff; augment groundwater recharge; reduce risk of flooding; and help address Los Angeles River Total Maximum Daily Load (TMDL) water quality requirements.

Following completion of the Project's construction in April 2016, monitoring was initiated to assess the effectiveness of the Project. During the monitoring period, 96 percent of the equivalent runoff from the Project design area was captured and infiltrated. Additional volume from the upstream tributary area was also captured and infiltrated over the course of the monitoring period, increasing the equivalent capture efficiency to well-beyond 100 percent of the design capture efficiency. Other notable Project benefits include:

  • An estimated long-term average annual infiltration volume of 41 acre-ft;
  • The implementation of a successful public outreach and education program, which included direct mailers to residents in the Project neighborhood; stakeholder engagement, including a partnership with a local church; a community meeting in coordination with the local City Council member; a Project website; and an outreach phone number;
  • Conservation of local water supplies via the replacement of turf and installation of drought-tolerant rain gardens, native landscaping, and mulch; and
  • Open space benefits and pedestrian friendly green connections within the community throughout the residential neighborhoods and the commercial district

Overall, the Project, which was funded in part from the State of California Water Resources Control Board (SWRCB) Proposition 84, was implemented via a successful partnership between LASAN, the City of Los Angeles Bureau of Engineering, the Los Angeles Department of Water and Power, the SWRCB,  WRD, Council for Watershed Health, Santa Monica Bay Restoration Commission, and Geosyntec Consultants.

Summary Participation (presentations)

Galvin, Pat. 2017. Demonstrating Compliance with Level 2 ERA Process Using a Combination of Volume and Flow Based Treatment Control BMPs. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Gray, Myles and Aaron Poresky. 2017. Geotechnical Risks of Infiltration BMPs: Estimating Groundwater Mounding and Soil Moisture Effects of Stormwater Infiltration. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Hanna, Mark and Wing Tam (City of Los Angeles). 2017. Broadway Neighborhood Stormwater Greenway Project. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Havens, Kelly, Lisa Austin, and Brian Currier (Sacramento State Office of Water Programs). 2017. Addressing PCBs and Mercury TMDLs in San Francisco Bay through Urban Runoff Treatment Retrofits – CW4CB Pilot Project Results. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Heyvaert, Alan (Desert Research Institute), Marc Leisenring, Rick Susfalk (DRI), Daniel Pankani, Andrea Buxton (Tahoe Resource Conservation District). 2017. Advances in Real-Time Stormwater Data Acquisition, Management and Analysis for the Lake Tahoe Basin. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Leisenring, Marc and Aaron Poresky. 2017. Multi-Objective Analysis of Stormwater Infrastructure Retrofits Using Genetic Algorithms: Two Case Studies. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Nasr, Laila. 2017. Avoiding Level 1 and 2 ERA – It All Starts with a Pollutant Source Assessment. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Steets, Brandon and Jared Ervin. 2017. A Sea Change Ahead for Bacteria TMDL Implementation. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Steets, Brandon and Megan Otto. 2017. Significant New BMP Performance Dataset Available for EWMP/ Water Quality Improvement Plan (WQIP) BMP Design, IGP Level 2 Planning, and PCB RAA Modeling. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Steets, Brandon and Jared Ervin. 2017. Non-Industrial Source Demonstration Interactive Scenario: Atmospheric Deposition. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Susilo, Ken and Wing Tam (City of Los Angeles). 2017. Greening the Los Angeles Public Right-of-Way: Prioritizing Green Stormwater for Multiple Benefits. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Susilo, Ken and Wing Tam (City of Los Angeles). 2017. Low Cost Integrated Delivery Urban Green Infrastructure Case Study: University Park Neighborhood Rain Gardens Pilot Study. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Tavakol-Davani, Hassan. 2017. A Watershed Scale Life Cycle Assessment Framework for Stormwater Management. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Young, Shannan (City of Dublin) and Kelly Havens. Balancing Permit Requirements, TMDLs, and the Nexus between Green Infrastructure Plans and Stormwater Resource Plans for the San Francisco Bay Area: A Case Study. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Boon, Richard (representing County of Orange), Alsop, Trevor and Aaron Poresky. 2017. South Orange County Water Quality Improvement Plan: A Roadmap for Watershed Rehabilitation. This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Strecker, Eric, Marc Leisenring, Jane Clary, and Jonathon Jones. International Stormwater BMP Database: How International is it? This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

Seeliger, David (MPE Engineering) and Myles Gray. 2017. City of Calgary Source Control Practice (Low Impact Development) Guidance and Monitoring Results. This email address is being protected from spambots. You need JavaScript enabled to view it., 2017 CASQA Conference. Sacramento, CA. September.

More Information

Learn more about the event at: https://www.casqa.org/events/annual-conference.
Read the program at: https://www.casqa.org/sites/default/files/annual_conferences/casqa-prog17-v11-r1-web.pdf.
For consultation regarding stormwater or water management, contact Ken Susilo at This email address is being protected from spambots. You need JavaScript enabled to view it..

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