Alhambra Creek Restoration: Flood Protection and Habitat Enhancement

esa.hostpyramid.net Image

The East Bay Area City of Martinez has historically been subject to flooding during large storms. With structures located directly adjacent to and on top of the Alhambra Creek channel, the downtown area is particularly vulnerable to flooding.

ESA developed a master plan and channel restoration designs for three reaches of Alhambra Creek to naturally protect against flooding. The team used the HEC-RAS hydraulic model to design a two-stage channel with a 100-foot floodplain/marshplain terrace located between Marina Vista Drive and the Union Pacific Railroad Bridge. Constructed as part of the Martinez intermodal facility project, this design solution tripled the width of riparian corridor, greatly increasing channel flood capacity and enhancing marsh and upland habitat. ESA assisted with innovative biotechnical bank stabilization solutions and the design for the expansion of the Union Pacific Railroad Bridge. These two projects helped to accommodate increased upstream channel capacity.

Over the past decade, ESA has worked closely with the City to restore key reaches of the creek, providing increased flood protection while naturally enhancing habitats along Alhambra Creek.

Specialized Services

  • Floodplain mapping
  • Hydrologic and hydraulic modeling
  • Monitoring
  • Multi-objective flood management