AgdaPkt 2025.10.27 Joint SA PFA - Laserfiche WebLink

Browse Search

Redwood City Stormwater Roadmap Recommended Assessments September 2025 6-1 Schaaf & Wheeler 6 Recommended Assessments Redwood City is actively advancing several high-priority stormwater and flood protection projects, such as the Redwood Shores Sea Level Rise Protection Project, which will enhance shoreline levees to meet FEMA accreditation criteria and account for projected sea-level rise scenarios (Redwood Shores Sea Level Rise Protection Project RFP, 2025). The City is also progressing with rehabilitation of critical pump stations, including Bradford and Price, and has secured funds toward the Redwood Creek Watershed and Wetland and Capacity Assessment. Although the City has made progress addressing high-risk stormwater infrastructure, the overall stormwater system has not been fully evaluated in more than 40 years. To support long-term planning, Schaaf & Wheeler recommends completing a Stormwater Master Plan, the first since 1986. Stormwater Master Plans should be updated every 20 years to identify and prioritize system improvements based on current design standards, current conditions, and regulatory requirements. In addition to the Stormwater Master Plan, the City is required by local agencies, like the San Francisco Bay Regional Water Quality Control Board and BCDC, to complete several near-term assessments and regulatory compliance projects. These efforts can be coordinated with the Master Plan to improve efficiency and reduce duplication. 6.1 Stormwater Master Plan The recommended Stormwater Master Plan typically contains the elements and sub- assessments as outlined in the following section. Schaaf & Wheeler has included a cost estimate range for the completion of each component. The City may choose to complete components separately if funding does not allow for a holistic study. However, we recommend the Stormwater Master Plan be completed unilaterally to maintain consistency, prevent systemic bottlenecks, and reduce the overall cost of completing the assessment. 6.1.1 Data Gaps Analysis A data gaps analysis is recommended to include a review of previous studies, available GIS data, topographic information, as-built drawings, analyses, and aerial imagery. From the review, the consultant should identify potential missing information that would be vital to the condition assessment and capacity analysis and highlight areas for field verification. Appendix A may be used as a starting point for the data gaps analysis. Estimated Cost: $10,000 to $20,000 range 6.1.2 Topographic Surface Information Collection A comprehensive bare earth topographic citywide surface should be developed, including open channel and creek geometries and topography in the overbank areas. The measured ground surfaces may be utilized to develop water levels in drainage channels, detention basins, creeks, and lagoons. Bathymetric survey measurements are recommended for lagoons, basins, and creeks. Existing topographic survey information should be reviewed to identify data gaps and determine focus areas. Estimated Cost: $300,000 to $600,000 11.A. - Page 24 of 53 455