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Redwood City Stormwater Roadmap Current Stormwater Challenges September 2025 4-3 Schaaf & Wheeler storm events. Addressing climate resiliency requires long-term planning and design adjustments that anticipate and mitigate these evolving risks. 4.2.4 Water Quality Water quality is a core component of the City’s stormwater responsibilities, particularly under the regulatory framework of the MRP. The permit requires the City to implement best management practices to reduce trash, sediment, and pollutant loads entering San Francisco Bay. Compliance with these requirements includes installation and maintenance of full trash capture devices, as well as stormwater treatment through green infrastructure, where feasible. In addition to meeting regulatory mandates, improving stormwater quality supports ecosystem health and reduces the environmental impacts of urban runoff. 4.3 Critical Stormwater Infrastructure Issues for Redwood City Several components of Redwood City’s stormwater system are considered critical infrastructure in need of near-term repair or upgrade. These assets either protect vulnerable neighborhoods, support systemwide drainage capacity, or are required for regulatory compliance. The following elements have been identified as priority needs based on recent studies and capital planning documents. 4.3.1 Levee System Upgrades One of the most pressing needs is raising the levee system along Redwood Shores. Much of the existing levee alignment is unaccredited by FEMA and was not designed to meet future 100-year coastal flood elevations, particularly under sea level rise projections. The Sea-Level Rise Vulnerability and Adaptation Planning Study recommends elevating shoreline protection from 13 – 15 feet to 16 – 17 feet NAVD88 to reduce flood exposure and maintain FEMA certification (ESA, 2024). 4.3.2 Pump Station Rehabilitation Upgrading critical stormwater pump stations is also an immediate priority. The Bradford and Price pump stations are in low-lying areas that do not drain by gravity and are highly vulnerable to tidal backflow. These facilities are outdated and undersized for 100-year design storms under both current and projected conditions. Although the City has secured federal and local funding for their rehabilitation, design and construction remain ongoing or pending (ESA, 2024; FY 2024 – 25 Adopted Budget, Redwood City, 2024). 4.3.3 Associated Pipe Network Improvements To fully support pump station performance, associated storm drain trunk lines must also be upgraded. Many of these pipe networks lack sufficient capacity for a 10-year or 30-year storm event and are at risk of surcharge or structural failure during major rainfall. The Eastern Low- Lying Area Drainage Master Plan recommends upgrading many pipe networks to meet 30-year capacity to reduce flooding and support coordinated pump station performance (Wood Rodgers, 2017). 11.A. - Page 20 of 53 451