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LID Guidance and Training for Southern California

This project aims to provide guidance and training for implementing Low Impact Development (LID) practices in Southern California. The project includes a literature review, development of an LID Manual, monitoring LID BMP effectiveness, and updating the manual based on monitoring findings. The project also involves revising the LID monitoring program and conducting an effectiveness assessment. Funding for this project is provided by Prop 84.

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LID Guidance and Training for Southern California

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  1. LID Guidance and Training for Southern California SMC Project Recommended Tasks September 24, 2013 RCFC&WCD

  2. LID Requirements and Implementation in SoCal • Required in all MS4 Permits • Priority emphasis on infiltration/retention • Implementation Manuals required and developed • Many projects approved with LID features • Prop 84 funded numerous LID implementation projects • However, actual performance 0f LID features is not well-verified • Flow reductions • Pollutant reductions • Long-term maintenance, BMP life cycles • Design details not widely evaluated or ground-truthed

  3. Original SMC LID Project Scope • Define LID for Southern California • Compile literature review and perform gap analysis • Conduct pre and post manual training • Develop the LID Manual • Monitor to evaluate LID BMP effectiveness • Feedback and update the manual based on monitoring findings LID Manual was completed and is now part of the CASQA LID Portal—now undergoing significant upgrade with Prop 84 funds Scope items completed in 2007-2010

  4. Monitor to Evaluate LID BMP Effectiveness • Field monitoring data from sites in southern California are needed to evaluate whether existing design and performance guidance are appropriate for development project acceptance by local jurisdictions • Monitoring results will be evaluated and used to revise the guidance manual as appropriate

  5. Technical/Monitoring Work • Approved QAPP/MP • Site monitoring so far • Scripps in San Diego • Pilot BMP site—UC Extension Irvine • Draft Monitoring Report November 2009 • Additional Monitoring Sites • Riverside County FC&WCD • City of Los Angeles site—Riverdale • Other Potential Monitoring Sites

  6. Guidance Manual Revision • Performance Table Evaluation/Revision • Table 15--BMP Performance – Hydrologic Impacts • Table 16. Environmental Benefits of BMPs • Table 17. BMP Performance – Influent/Effluent Water Quality • Table 18. BMP Site Suitability Criteria • Table 19. Maintenance Considerations for LID BMPs • Cost factors

  7. Monitoring is Part of Performance/Effectiveness Assessment • Includes Several Component Strategies • Basic field performance evaluation on existing LID structures • Compiling existing LID performance data/databases and providing in map format • Linking LID monitoring results with available data on adjacent receiving streams • Where available, collecting more intensive, process variable data at selected LID facilities to support future modeling (modeling is beyond original scope)

  8. Recommendation • Review and revise the LID effectiveness monitoring program to incorporate new information and strategies, and to initiate the feedback and update process for the LID Manual • Review monitoring objectives and revise as needed • Evaluate original Monitoring Goals (2006) • Evaluate original management questions (2006) • Revise the monitoring goals and objectives to suit current project needs • Review MP and incorporate ongoing and new sites • Develop comprehensive evaluation approach • Develop and report recommendations to the SMC for revised LID effectiveness monitoring/ performance assessment and Manual update

  9. Proposed SMC Actions • Authorize $20K to conduct the re-scoping tasks • Develop workplan and schedule -target revised scope to be available by next SMC meeting • Develop RFP to conduct the monitoring and effectiveness assessment under SMC direction • Authorize $125K to conduct effectiveness assessment; 18—24 month project • RCFC&WCD site partnership • Work with UCCE, City of LA, Scripps, others • Partner with CASQA to revise/update the LID Manual • Reserve $50K for this effort

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