PWA - Project Detail - Green Valley

Green Valley Creek drains a large watershed in Fairfield, California, flowing southward, crossing underneath I-80 and emptying into Suisun Marsh. The Creek’s undersized and unstable channel provided limited habitat value and created flood hazards on adjacent lands proposed for development. PWA, working in concert with a team of civil engineers and biologists, developed a restoration and flood management plan that protected the surrounding lands from flood hazards and added habitat value for local species.

PWA coordinated with the City of Fairfield, local and state agencies and team members to integrate geomorphic, hydraulic and biologic concerns into the final plan. The restoration plan provided flood conveyance and riparian enhancement in a multi-stage vegetated channel along a one-mile reach. Extensive channel and terrace grading resulted in revegetation and floodplain connection. Innovative design features were incorporated to protect existing mature oak trees on upland terraces and freshwater wetland mitigation on the overflow floodplain terraces.

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Title		Green Valley Creek Restoration and Flood Control (pdf) 136KB
Project Summary		Working in concert with a team of civil engineers and biologists, PWA developed a restoration and flood management plan to protect the lands surrounding Green Valley Creek from flood hazards.
Date		1991–1994
Location		Fairfield, CA
Client		City of Fairfield, California

Project Detail		Green Valley Creek drains a large watershed in Fairfield, California, flowing southward, crossing underneath I-80 and emptying into Suisun Marsh. The Creek’s undersized and unstable channel provided limited habitat value and created flood hazards on adjacent lands proposed for development. PWA, working in concert with a team of civil engineers and biologists, developed a restoration and flood management plan that protected the surrounding lands from flood hazards and added habitat value for local species. PWA coordinated with the City of Fairfield, local and state agencies and team members to integrate geomorphic, hydraulic and biologic concerns into the final plan. The restoration plan provided flood conveyance and riparian enhancement in a multi-stage vegetated channel along a one-mile reach. Extensive channel and terrace grading resulted in revegetation and floodplain connection. Innovative design features were incorporated to protect existing mature oak trees on upland terraces and freshwater wetland mitigation on the overflow floodplain terraces.