The project location is at the discharge point of the Bayfront Canal to Flood Slough, and involves Ponds S5 & R5 north of Highway 84 and east of Marsh Road.
The City of Redwood City is partnering with the Coastal Conservancy to integrate the Salt Pond Restoration Project with the Bayfront Canal/Atherton Channel Flood Improvement Project. This integrated project will direct stormwater to Ponds S5 & R5 to enhance the habitat as well as serve as stormwater detention for the Bayfront Canal and Atherton Channel drainage areas.
The City of Redwood City is
partnering with the Coastal Conservancy to integrate the Salt Pond
Restoration Project with the Bayfront Canal/Atherton Channel Flood
The South Bay Salt Pond Restoration Project is the largest tidal wetland restoration project on the West Coast. When complete, the project will restore 15,100 acres of industrial salt ponds to tidal wetlands and other habitats.
project will direct stormwater to Ponds S5 & R5 to enhance the habitat as
well as serve as stormwater detention for the Bayfront Canal and Atherton
Channel drainage areas.
Drinking Water Supply
Water Quality Improvement
Habitat Protection and Restoration
Flood protection is increased by routing storm flows from the over-capacity Bayfront Canal to the salt ponds as detention. Storm flows from the Bayfront Canal will enhance the habitat quality of the salt ponds, positively contributing to the salt pond restoration effort.
This project utilizes effective stormwater management to enhance habitat restoration.
Currently, this project is already a multi-beneficial project.
Yes, this is currently already a collaborative partnership project involving Redwood City, the State Coastal Conservancy, and the Don Edwards Wildlife Refuge.
Yes, the stormwater runoff is routed to detention ponds before discharging to the Bay, which will reduce stormwater contaminants to the Bay.
Part 2 - Detail
The Bayfront Canal, maintained
by Redwood City through easement, is the single stormwater transmission canal for
the Atherton Channel and six drainage basins, discharging through a single
outlet to Flood Slough and into the Bay.
In addition to Redwood City, neighboring jurisdictions including
unincorporated San Mateo County, the cities of Atherton and Menlo Park, and the
Town of Woodside, all generate runoff into the Bayfront Canal via flows from
the Atherton Channel and/or other drainage basins. Flooding occurs in
the neighborhoods and communities around and near the Bayfront Canal and
Atherton Channel. During storms that
coincide with high tides, the Canal and Channel cannot discharge sufficient stormwater
flows to the Bay because of tide gate limitations. Depending on the intensity of the storm, the
Canal and the Channel do not have enough detention capacity to prevent flooding
in low lying areas.
This project proposes to route flood flows from the Bayfront Canal and Atherton Channel into the managed ponds that are part of the Ravenswood Pond Complex and the South Bay Salt Ponds Restoration project. Ponds S5 & R5 of the Ravenswood pond complex currently are managed ponds adjacent to Bayfront Park and Flood Slough, and flood flows from the Canal will be bypassed around the Flood Slough tide gate and routed into these ponds to facilitate the development of a seasonal wetlands habit and help mitigate the flooding problem.
Bayfront Canal and South Bay Salt Ponds S5/R5 Flood Mitigation Feasibility Study, by Moffatt & Nichol, May 22, 2012.
Opportunities and Constraints for Ravenswood Pond Complex, South Bay Salt Ponds Restoration, Phase II, by URS, June 28, 2012.
Ravenswood Pond Complex
This project will mitigate chronic and widespread flooding in the Bayfront Canal (Redwood City) and Atherton Channel (Menlo Park) neighborhoods. In addition, the project will provide a source of fresh water to enhance and restore the habitat of the ponds in the Ravenswood complex. It will also reduce contaminants from urban runoff to the Bay by detaining the stormwater in the ponds before discharge to the Bay.
If the project is not implemented the neighborhoods in Redwood City, Menlo Park, and unincorporated San Mateo County will continue to experience chronic and widespread flooding. In addition, the salt ponds will not have the opportunity to gain a source of fresh water to enhance the pond's habitat, which can potentially hinder the habitat restoration of the ponds.
i. Water Quality - The project will reduce contaminants from urban runoff to the Bay by detaining the stormwater in the ponds before discharge to the Bay.
ii. Flood and Stormwater Management - Flood mitigation and enhance stormwater management can be achieved by this project by utilizing the adjacent ponds as stormwater detention.
iii. Resource Stewardship (watershed management, habitat protection and restoration, recreation, open space, etc.) - This project will provide a source of fresh water (from stormwater runoff) to enhance and restore the habitat of the ponds in the Ravenswood complex. This project demonstrates an unique opportunity to mitigate flooding and enhance habitat restoration.
Increases Water Supply Reliability
Advances/ Expands Conjunctive Management of Multiple Water Supply Sources
Increases Water Use and/or Reuse Efficiency
Provides Additional Water Supply
Promotes Water Quality Protection
Reduces Water Demand
Advances/Expands Water Recycling
Promotes Urban Runoff Reuse
Addresses Sea Level Rise
Addresses other Anticipated Climate Change Impact (e.g. through water management system modifications)
Improves Flood Control (e.g. through wetlands restoration, management, protection)