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Hydraulic Model Development and Calibration City of Redwood City (0011239.02)2-9 Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 2.3.2 Base Wastewater Flow Residential and non-residential base wastewater flows were estimated using information compiled at the parcel (subcatchment) level, as described below. 2.3.2.1 Existing Flows Existing BWF was determined based on sewer accounts and water consumption data provided by the City. The data also included parcels in Emerald Lake Heights and the two smaller County SMDs that are served by Redwood City. Metered water use during the winter months most closely approximates wastewater generation, since outdoor water use is at a minimum. Therefore, meter readings during the 2018/2019 winter season were used as the basis for estimating residential and non-residential BWF. Data for permitted dischargers in Redwood City were provided by SVCW and used to estimate BWF for those users. For Fair Oaks SMD, actual data from the County’s permanent meter were used. 2.3.2.2 Future Flows Although the City is largely built out, there is considerable new development and redevelopment projected, particularly in the Downtown area. To support this Master Plan, planning staff of the City’s Community Development Department provided detailed listings of developments “in the pipeline”, as well as parcels reasonably anticipated to experience redevelopment within the next 20 years based on the City’s General Plan and Downtown Precise Plan. Appendix C includes a listing of all of these projected future and potential developments (not including those located in the Redwood City portions of the Fair Oaks SMD). Note that over the past few years since the original list was provided in September 2019, some of the projects have already been constructed. However, since the existing model scenario is based on the 2018/19 winter season, these recently constructed projects are shown as near-term future projects in this report. The City will be updating the model in the future on a periodic or as-needed basis to incorporate changes in development as well as new sewer improvements. Figure 2-7 and Figure 2-8 show the locations of planned (“near-term”) and potential (“long-term”) developments. Although the long-term developments may not be specifically defined at this time, it is important to include the best possible estimate of maximum future development in order to plan for and size new infrastructure appropriately. For Fair Oaks SMD, future flows derived from the Fair Oaks SMD model developed by the County in 2021 were input to the Redwood City model directly. The Fair Oaks SMD model includes potential future developments in Redwood City tributary to the Fair Oaks SMD system, as well as other developments identified by the County. The County is in the process of updating the Fair Oaks SMD model and sewer master plan, which may result in increases in projected development within that district. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 125 of 317