Stormwater Symposium

Oral

396540 - Watershed Wide Regional BMP Optimization for MS4 Compliance: Experience from the Lower LA River Upper Reach 2 Feasibly Study

Monday, June 4
4:00 PM - 5:30 PM
Location: Mirage Room
Co-Authors: Troy Dorman, San Antonio – Tetra Tech; Oliver Galang, Pasadena – Tetra Tech; Troy Dorman, San Antonio – Tetra Tech; Troy Dorman, San Antonio – Tetra Tech

A Feasibility Study was performed to evaluate six proposed regional projects identified in the Los Angeles River Upper Reach 2 Watershed Management Area Watershed Management Program. In order to address the water quality limits as set forth in the WMP, the objective of the Feasibility Study was to evaluate the development of regional stormwater capture and subsurface infiltration projects.
Tetra Tech developed site-specific project concepts that balanced diversion rates, available project areas, and costs to provide solutions that allow the Cities to achieve shared pollutant load reduction targets. The project team made multiple updates to the EPA SUSTAIN model to allow for BMP-specific performance data and refined costing information to be incorporated. A “state of the science” modeling approach was incorporated that evaluated potential diversion rates and BMP footprints simultaneously at the 6 proposed regional BMPs in concert to determine the combined impact to the overall watershed. This “nested” analysis approach provided the most accurate representation of several interdependent drainage networks within the drainage area and optimized the cumulative pollutant load reduction for the overall watershed by considering the impacts of the performance of BMPs located upstream and downstream of a particular BMP location. This approach more accurately predicts the performance and pollutant load reductions for the overall watershed allowing the Cities to strategically invest where impact is highest. Implementing the modeling approach, and considering multiple site specific components including infiltration, indicated that compliance targets could be met with half of the proposed BMP area resulting in significant cost savings.

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396540 - Watershed Wide Regional BMP Optimization for MS4 Compliance: Experience from the Lower LA River Upper Reach 2 Feasibly Study



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