AgdaPkt 2019-06-24 Joint SA PFA - Laserfiche WebLink

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6.S. - Page 25 of 61 REDWOOD CITY Data • Rainfall • HRUs/Land Use • Impervious • Elevation • Slopes • Evaporation • Infiltration Watershed Model RacPlinP Results Hourly runoff and sediment/pollutant loads GREEN INFRASTRUCTURE PLAN GI Capacities I and Capture Volumes forOptimize by Optimize by I® Jurisdiction Subcatchment jw Target l Reductions ::.;y;...,,;....,.¢::m::; Figure 3. Modeling System Supporting the RAA. For this analysis, model cost functions were developed from literature, including an inventory of projects in the Los Angeles region. Because of uncertainty regarding the true costs to C/CAG member agencies, results were normalized for relative comparison—the relative costs between project types is well represented for the optimization of project types in the RAA. In other words, although it is not recommended to use the RAA costs to project county- wide or city-wide implementation costs, they are sufficiently resolved for comparing alternative implementation scenarios and selecting the most cost- effective strategies and combination of GI, LID, and regional stormwater capture projects to meet pollutant reduction targets. The LSPC model provides a characterization of existing conditions and determination of necessary pollutant load reductions to meet requirements of TMDLs and the MRP. SUSTAIN provides analysis of the amount of GI needed to provide the portion of the load reduction assigned to GI by the MRP. Appendices C and D provide more detailed discussion of the models and their application to the San Mateo County watersheds. 2.5 Model Considerations to Inform GI Plans An important consideration for the RAA was the ability to track costs and benefits of different categories of GI projects within the model. This tracking RWC GREEN INFRASTRUCTURE PLAN 14 JUNE 2019 ATTY/RESO.0075/CC RESO APPROVING THE GREEN INFRASTRUCTURE PLAN — EXHIBIT A REV: 06-20-19 PR 237