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City of Redwood City (0011239.02)i Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 TABLE OF CONTENTS SECTION PAGE NO. EXECUTIVE SUMMARY ..................................................................................................................................................1 Sanitary Sewer System and Service Area .............................................................................................................1 Background and Purpose of Master Plan ..............................................................................................................1 How the Master Plan was Prepared.......................................................................................................................4 Capacity Assessment Considers Existing and Future Planning Scenarios.................................................4 Hydraulic Modeling Identifies Potential Capacity Deficiencies ....................................................................4 Proposed Improvement Projects Address the Potential Capacity Deficiencies ..........................................5 Recommended Capacity Improvement Program ...................................................................................................6 Project Rankings and Flow Confirmation Levels .......................................................................................12 Project Implementation Recommendations...............................................................................................15 Recommendations for Future Flow Monitoring .........................................................................................15 1.INTRODUCTION ................................................................................................................................................1-1 1.1 Background and Study Objectives ....................................................................................................1-1 1.2 Study Area ........................................................................................................................................1-1 1.3 Existing Sewer System .....................................................................................................................1-3 1.3.1 Main City Area Sewer System ...............................................................................................1-3 1.3.2 Seaport/Pacific Shores Network ............................................................................................1-7 1.3.3 Redwood Shores Network .....................................................................................................1-7 1.4 Scope of Study .................................................................................................................................1-7 1.5 Report Organization..........................................................................................................................1-8 2.HYDRAULIC MODEL DEVELOPMENT AND CALIBRATION ..........................................................................2-1 2.1 Modeled System ...............................................................................................................................2-1 2.2 Flow Monitoring Program ..................................................................................................................2-4 2.3 Flow Estimating Methodology ...........................................................................................................2-8 2.3.1 Wastewater Flow Components ..............................................................................................2-8 2.3.2 Base Wastewater Flow ..........................................................................................................2-9 2.3.2.1 Existing Flows .........................................................................................................2-9 2.3.2.2 Future Flows ............................................................................................................2-9 2.3.2.3 BWF Diurnal Profiles .............................................................................................2-12 2.3.2.4 BWF Projections ....................................................................................................2-14 2.3.3 Groundwater Infiltration........................................................................................................2-14 2.3.4 Rainfall-Dependent I&I .........................................................................................................2-14 2.4 Model Calibration ............................................................................................................................2-15 2.4.1 Dry Weather Calibration.......................................................................................................2-16 2.4.2 Wet Weather Calibration ......................................................................................................2-17 3.CAPACITY AND I/I ASSESSMENT ...................................................................................................................3-1 3.1 Design Flow and Performance Criteria .............................................................................................3-1 3.1.1 Design Storm Condition .........................................................................................................3-1 3.1.2 Capacity Deficiency Criteria ...................................................................................................3-2 3.1.3 Design Criteria for New Facilities ...........................................................................................3-3 3.2 Capacity Analysis Results ................................................................................................................3-3 ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 83 of 317